Gr 11 Physical Sciences: Ch 2 Sum Newton’s laws

What is the primary function of a force?

To slow down an object
To maintain the shape of an object
To cause a change to an object (correct)
To create a new object

What is an example of a non-contact force?

The force of the wind turning a windmill
Gravity, such as the Earth's pull on the Moon (correct)
The force a sculptor uses to shape clay
The force used to push or pull objects

What is the unit of force in the International System of Units (SI)?

Joule (J)
Meter (m)
Newton (N) (correct)
Kilogram (kg)

What is the resultant force?

The vector sum of all the forces acting on an object (C) Signup and view all the answers

What is the normal force?

The force exerted by a surface on an object to balance the gravitational force (A) Signup and view all the answers

What is a characteristic of a force?

It has both magnitude and direction (A) Signup and view all the answers

What type of force is the force of the wind turning a windmill?

Contact force (C) Signup and view all the answers

What is the symbol often used to represent force?

( \vec{F} ) (A) Signup and view all the answers

What is the primary function of friction forces?

To oppose the motion of an object (A) Signup and view all the answers

What is the effect of a lift accelerating upwards on an object's apparent weight?

It makes the object feel heavier. (A) Signup and view all the answers

What is the difference between static and kinetic friction?

Static friction occurs when an object is at rest, while kinetic friction occurs when an object is moving (A) Signup and view all the answers

What is the definition of Newton's Third Law of Motion?

For every action, there is an equal and opposite reaction. (C) Signup and view all the answers

What is the coefficient of friction?

A constant for a given pair of surfaces (B) Signup and view all the answers

What is the resultant force acting on an object in equilibrium?

A force equal to zero. (C) Signup and view all the answers

What is the purpose of a force diagram?

To represent all the forces acting on a system (C) Signup and view all the answers

What is the force that opposes the motion of an object in contact with a surface?

Frictional force. (D) Signup and view all the answers

In a free-body diagram, what does the dot represent?

The object of interest (C) Signup and view all the answers

What is the coefficient of friction?

A constant that depends on the surface and object. (D) Signup and view all the answers

When resolving forces into components, what is the normal force dependent on?

The component of the gravitational force perpendicular to the slope (A) Signup and view all the answers

What is the formula for the gravitational force between two objects?

F = G(m1 * m2) / d^2 (D) Signup and view all the answers

What is Newton's First Law of Motion?

An object continues in its state of motion unless acted on by an unbalanced force (C) Signup and view all the answers

What is the direction of the gravitational force between two objects?

Along the line connecting the centers of the objects. (A) Signup and view all the answers

What is the mathematical representation of Newton's Second Law of Motion?

F = ma (B) Signup and view all the answers

What is the value of the gravitational acceleration near the surface of the Earth?

9.8 m/s^2 (A) Signup and view all the answers

What is the purpose of resolving forces into components?

To analyze forces on inclined planes. (B) Signup and view all the answers

When an object is on an inclined plane, what causes it to accelerate down the slope?

The component of the gravitational force parallel to the slope (B) Signup and view all the answers

What is the direction of the net force when a lift accelerates upward?

Upward (D) Signup and view all the answers

What is the purpose of drawing a free body diagram?

To represent the forces acting on the object. (A) Signup and view all the answers

What is the unit of measurement for weight?

Newtons (N) (A) Signup and view all the answers

Why do astronauts in space experience weightlessness?

Because they are in continuous free fall around the Earth (B) Signup and view all the answers

What is the relationship between weight and mass?

Weight is directly proportional to mass (A) Signup and view all the answers

What is the acceleration due to gravity at the Earth's surface?

It is the same for all objects (C) Signup and view all the answers

What is the unit of measurement for mass?

Kilograms (kg) (C) Signup and view all the answers

What occurs when there is no normal force acting on an object?

Weightlessness (A) Signup and view all the answers

What type of problems involve calculating a quantity in terms of another known quantity?

Comparative problems (A) Signup and view all the answers

What is the equation that relates gravitational force, mass, and gravitational acceleration?

F = mg (C) Signup and view all the answers

Which of the following is a characteristic of a contact force?

It can change the shape of an object. (A) Signup and view all the answers

What is the effect of a force on an object's motion?

It can cause the object to change direction or speed. (D) Signup and view all the answers

Which of the following forces is an example of a non-contact force?

The force of gravity between the Earth and an object. (B) Signup and view all the answers

What is the direction of the normal force exerted by a surface on an object?

Perpendicular to the surface. (B) Signup and view all the answers

What is the ultimate effect of the resultant force on an object?

It has the same effect as all the individual forces acting together. (D) Signup and view all the answers

What is the nature of force?

It is a vector quantity with both magnitude and direction. (D) Signup and view all the answers

What is the primary function of a force in physics?

To cause a change in an object's motion. (B) Signup and view all the answers

Which of the following is an example of a force that can cause an object to change its direction?

The force of a wind turning a windmill. (B) Signup and view all the answers

What is the main reason for an object to accelerate down an inclined plane?

The component of the gravitational force parallel to the slope (C) Signup and view all the answers

Which type of friction prevents motion up to a certain maximum value?

Static friction (D) Signup and view all the answers

What is the purpose of drawing a free-body diagram?

To represent all the forces acting on an object (C) Signup and view all the answers

What is the relationship between the normal force and the coefficient of friction?

The coefficient of friction depends on the normal force (B) Signup and view all the answers

What is the formula for the kinetic frictional force?

f_k = μ_k N (B) Signup and view all the answers

What is the direction of the acceleration when an object is moving under the influence of a net force?

Parallel to the net force (D) Signup and view all the answers

What is the purpose of resolving forces into components?

To simplify calculations involving inclined planes (D) Signup and view all the answers

What is the property of an object that causes it to continue in its current state of motion?

Inertia (B) Signup and view all the answers

What is the formula for the static frictional force?

f_s = μ_s N (D) Signup and view all the answers

What is the direction of the net force when an object is in equilibrium?

Zero (C) Signup and view all the answers

What is the primary difference between mass and weight?

Mass is a scalar quantity while weight is a vector quantity. (D) Signup and view all the answers

Why do astronauts in orbit around the Earth experience weightlessness?

Because they are in a state of continuous free fall around the Earth. (B) Signup and view all the answers

What is the purpose of solving comparative problems in physics?

To relate a quantity in one situation to a known quantity in another situation. (D) Signup and view all the answers

What is the relationship between the weight of an object and its mass?

Weight is directly proportional to the mass. (A) Signup and view all the answers

What happens to an object when there is no normal force acting on it?

It becomes weightless. (C) Signup and view all the answers

What is the gravitational acceleration on an object near the Earth's surface?

9.8 m/s^2 (A) Signup and view all the answers

What is the equation that relates the gravitational force, mass, and gravitational acceleration?

F = mg (B) Signup and view all the answers

What is the characteristic of the gravitational force acting on an object near the Earth's surface?

It is the same for all objects. (C) Signup and view all the answers

What is the net force acting on an object in a state of equilibrium?

Zero (D) Signup and view all the answers

When a lift accelerates downwards, what happens to the normal force?

It decreases (D) Signup and view all the answers

What is the direction of the frictional force acting on an object moving on a surface?

Parallel to the surface (C) Signup and view all the answers

What is the condition for an object to be in equilibrium?

The sum of the forces acting on it is zero and the resultant force is zero (C) Signup and view all the answers

What is the relation between the gravitational force and the distance between two objects?

It is inversely proportional to the square of the distance (A) Signup and view all the answers

What is the purpose of drawing a free body diagram?

To represent the forces acting on an object (B) Signup and view all the answers

What is the difference between action and reaction forces?

Action and reaction forces are equal in magnitude and opposite in direction (C) Signup and view all the answers

What happens to the apparent weight of an object when it is in a lift accelerating upwards?

It increases (A) Signup and view all the answers

What is the force that prevents relative motion between surfaces up to a certain maximum value?

Static friction (B) Signup and view all the answers

When resolving forces into components, what is the formula for the x-component of the gravitational force?

Fgx = Fg sin(θ) (C) Signup and view all the answers

What is a common effect of a force on an object?

Changing the object's shape (C) Signup and view all the answers

What is the primary difference between a contact force and a non-contact force?

The need for physical contact (B) Signup and view all the answers

What is the vector sum of all the forces acting on an object?

The resultant force (D) Signup and view all the answers

What type of force is the force of the Earth's pull on the Moon?

Non-contact force (A), Gravitational force (C) Signup and view all the answers

What is the direction of the normal force exerted by a surface on an object?

Perpendicular to the surface (D) Signup and view all the answers

What is the primary function of forces in physics?

To cause a change in objects (C) Signup and view all the answers

What is an example of a force that can cause an object to change its direction?

All of the above (D) Signup and view all the answers

What is a characteristic of force?

It has both magnitude and direction (D) Signup and view all the answers

What is the physical quantity that remains constant for an object regardless of its location?

Mass (D) Signup and view all the answers

What is the condition necessary for an object to experience weightlessness?

The object is in free fall (C) Signup and view all the answers

What type of problems involve calculating a quantity in terms of another known quantity?

Comparative problems (A) Signup and view all the answers

What is the equation that relates gravitational force, mass, and gravitational acceleration?

F = m × g (B) Signup and view all the answers

Why do astronauts in space experience weightlessness?

Because they are in continuous free fall around the Earth (B) Signup and view all the answers

What is the relationship between weight and mass?

Weight is proportional to mass (B) Signup and view all the answers

What is the primary difference between mass and weight?

Mass is a scalar quantity, while weight is a vector quantity (D) Signup and view all the answers

What is the purpose of solving comparative problems?

To analyze and predict the gravitational interactions between objects (D) Signup and view all the answers

What is the primary factor that determines the magnitude of the kinetic frictional force between two surfaces?

The normal force between the surfaces (B) Signup and view all the answers

A force diagram is used to visualize the forces acting on an object. What is the primary purpose of drawing a force diagram?

To identify the forces acting on an object (C) Signup and view all the answers

An object is moving on a horizontal surface with a constant velocity. What can be concluded about the forces acting on the object?

The net force is zero (B) Signup and view all the answers

What is the relationship between the static frictional force and the normal force?

The static frictional force is proportional to the normal force (D) Signup and view all the answers

An object is placed on an inclined plane. What causes the object to accelerate down the slope?

The gravitational force parallel to the slope (D) Signup and view all the answers

What is the net force acting on an object in equilibrium?

Zero (D) Signup and view all the answers

What is the apparent weight of an object when it is in a lift accelerating upwards?

Greater than its true weight (D) Signup and view all the answers

When resolving forces into components, what is the primary advantage of using a coordinate system aligned with the inclined plane?

It simplifies the calculations (B) Signup and view all the answers

What is the purpose of using Newton's Second Law of Motion in solving problems?

To calculate the acceleration of an object (A) Signup and view all the answers

What is the force that opposes the motion of an object moving down an inclined plane?

Frictional force (A) Signup and view all the answers

What is the relationship between the coefficient of kinetic friction and the coefficient of static friction?

The coefficient of kinetic friction is always less than the coefficient of static friction (D) Signup and view all the answers

What is the direction of the gravitational force between two objects?

Along the line connecting the centers of the objects (A) Signup and view all the answers

What is the condition for an object to be in equilibrium?

The sum of the forces acting on it is zero (B) Signup and view all the answers

What is the primary advantage of using free-body diagrams in solving problems?

It helps to identify the forces acting on an object (C) Signup and view all the answers

What is the direction of the acceleration when an object is moving under the influence of a net force?

In the direction of the net force (D) Signup and view all the answers

What is the purpose of resolving forces into components?

To simplify the analysis of complex forces (C) Signup and view all the answers

What is the formula for the maximum static frictional force?

f_s = μ_s N (D) Signup and view all the answers

What is the direction of the normal force exerted by a surface on an object?

Perpendicular to the surface (B) Signup and view all the answers

What is the effect of a lift accelerating downwards on an object's apparent weight?

It decreases the apparent weight (C) Signup and view all the answers

What is the purpose of a free-body diagram?

To show the forces acting on an object (A) Signup and view all the answers

A block of mass 10 kg is pulled up a rough inclined plane with a force of 60 N, parallel to the inclined plane. If the angle of the inclined plane is 30°, what is the magnitude of the acceleration of the block?

2.5 m/s² (B) Signup and view all the answers

A 5 kg object is moving on a horizontal surface with a velocity of 2 m/s. If the coefficient of kinetic friction is 0.2, what is the magnitude of the force required to keep the object moving at a constant velocity?

20 N (C) Signup and view all the answers

A rope is used to pull a crate of mass 50 kg up a rough inclined plane with a force of 200 N, parallel to the inclined plane. If the angle of the inclined plane is 45° and the coefficient of static friction is 0.5, what is the minimum magnitude of the normal force required to prevent the crate from sliding down the plane?

250 N (D) Signup and view all the answers

A 20 kg box is being pulled up a rough inclined plane with a force of 100 N, parallel to the inclined plane. If the coefficient of kinetic friction is 0.3, what is the magnitude of the acceleration of the box?

2.5 m/s² (D) Signup and view all the answers

A 10 kg object is moving down a rough inclined plane with a velocity of 3 m/s. If the angle of the inclined plane is 60° and the coefficient of kinetic friction is 0.4, what is the magnitude of the acceleration of the object?

4.5 m/s² (B) Signup and view all the answers

A 5 kg object is placed on a horizontal surface and subjected to a force of 20 N, parallel to the surface. If the coefficient of kinetic friction is 0.3, what is the magnitude of the acceleration of the object?

2.5 m/s² (C) Signup and view all the answers

A 20 kg box is being pulled up a rough inclined plane with a force of 150 N, parallel to the inclined plane. If the angle of the inclined plane is 30° and the coefficient of static friction is 0.6, what is the minimum magnitude of the normal force required to prevent the box from sliding down the plane?

150 N (A) Signup and view all the answers

A 10 kg object is moving on a horizontal surface with a velocity of 2 m/s. If the coefficient of kinetic friction is 0.2, what is the magnitude of the force required to bring the object to rest in a distance of 5 m?

40 N (B) Signup and view all the answers

A 5 kg object is placed on a rough inclined plane with an angle of 45°. If the coefficient of static friction is 0.5, what is the minimum magnitude of the force required to prevent the object from sliding down the plane?

25 N (D) Signup and view all the answers

A 20 kg box is being pulled up a rough inclined plane with a force of 180 N, parallel to the inclined plane. If the angle of the inclined plane is 60° and the coefficient of kinetic friction is 0.4, what is the magnitude of the acceleration of the box?

4.5 m/s² (B) Signup and view all the answers

When a lift accelerates upward, what is the relationship between the apparent weight and the normal force?

The apparent weight is greater than the normal force. (D) Signup and view all the answers

Which of the following is a characteristic of action-reaction pairs?

They have equal magnitude but opposite direction. (D) Signup and view all the answers

What is the direction of the static frictional force when an object is on a horizontal surface?

Parallel to the surface. (D) Signup and view all the answers

When resolving forces into components, what is the direction of the component of the gravitational force parallel to the slope?

Down the slope. (B) Signup and view all the answers

What is the relationship between the coefficient of static friction and the coefficient of kinetic friction?

The coefficient of static friction is always greater than the coefficient of kinetic friction. (A) Signup and view all the answers

What is the effect of a net force on an object in equilibrium?

It has no effect on the object. (A) Signup and view all the answers

What is the direction of the gravitational force between two objects?

Along the line connecting the centers of the two objects. (A) Signup and view all the answers

What is the purpose of drawing a free-body diagram?

To represent the forces acting on an object. (D) Signup and view all the answers

When an object is on an inclined plane, what is the direction of the net force that causes it to accelerate down the slope?

Down the slope. (D) Signup and view all the answers

What is the relationship between the normal force and the gravitational force when an object is on a horizontal surface?

The normal force is equal to the gravitational force. (A) Signup and view all the answers

What is the primary difference between mass and weight?

Mass is a measure of the amount of matter, while weight is a measure of the force of gravity. (D) Signup and view all the answers

What is the condition for an object to experience weightlessness?

When it is experiencing no normal force. (B) Signup and view all the answers

What is the purpose of solving comparative problems?

To predict the gravitational interactions between objects. (B) Signup and view all the answers

What is the equation that relates the gravitational force, mass, and gravitational acceleration?

F = mg (D) Signup and view all the answers

What is the primary difference between an object's mass and its weight on the surface of the Earth?

Mass is constant, while weight changes with location. (B) Signup and view all the answers

What is the characteristic of an object that remains constant regardless of its location?

Mass (D) Signup and view all the answers

What is the primary reason why astronauts in space experience weightlessness?

Because they are experiencing no normal force. (C) Signup and view all the answers

What is the method for solving comparative problems?

All of the above, in the correct order. (D) Signup and view all the answers

What is the primary difference between a contact force and a non-contact force?

The necessity of physical contact (C) Signup and view all the answers

Which of the following is an example of a force that can change the shape of an object?

The force used to push or pull objects (A) Signup and view all the answers

What is the resultant force of two forces acting on an object, one of which is 5 N and the other is 3 N, in opposite directions?

2 N (A) Signup and view all the answers

What is the normal force exerted by a surface on an object, in terms of the gravitational force?

Perpendicular to the gravitational force (C) Signup and view all the answers

What is the direction of the force exerted by a magnet on a paper clip?

Towards the magnet (D) Signup and view all the answers

What is the characteristic of forces that allows them to be classified as either contact or non-contact?

Physical contact (D) Signup and view all the answers

What is the relationship between the normal force and the surface on which an object is placed?

The normal force is perpendicular to the surface (A) Signup and view all the answers

Gr 11 Physical Sciences: Ch 2 Sum Newton’s laws

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Questions and Answers

What is the primary function of a force?

What is an example of a non-contact force?

What is the unit of force in the International System of Units (SI)?

What is the resultant force?

What is the normal force?

What is a characteristic of a force?

What type of force is the force of the wind turning a windmill?

What is the symbol often used to represent force?

What is the primary function of friction forces?

What is the effect of a lift accelerating upwards on an object's apparent weight?

What is the difference between static and kinetic friction?

What is the definition of Newton's Third Law of Motion?

What is the coefficient of friction?

What is the resultant force acting on an object in equilibrium?

What is the purpose of a force diagram?

What is the force that opposes the motion of an object in contact with a surface?

In a free-body diagram, what does the dot represent?

What is the coefficient of friction?

When resolving forces into components, what is the normal force dependent on?

What is the formula for the gravitational force between two objects?

What is Newton's First Law of Motion?

What is the direction of the gravitational force between two objects?

What is the mathematical representation of Newton's Second Law of Motion?

What is the value of the gravitational acceleration near the surface of the Earth?

What is the purpose of resolving forces into components?

When an object is on an inclined plane, what causes it to accelerate down the slope?

What is the direction of the net force when a lift accelerates upward?

What is the purpose of drawing a free body diagram?

What is the unit of measurement for weight?

Why do astronauts in space experience weightlessness?

What is the relationship between weight and mass?

What is the acceleration due to gravity at the Earth's surface?

What is the unit of measurement for mass?

What occurs when there is no normal force acting on an object?

What type of problems involve calculating a quantity in terms of another known quantity?

What is the equation that relates gravitational force, mass, and gravitational acceleration?

Which of the following is a characteristic of a contact force?

What is the effect of a force on an object's motion?

Which of the following forces is an example of a non-contact force?

What is the direction of the normal force exerted by a surface on an object?

What is the ultimate effect of the resultant force on an object?

What is the nature of force?

What is the primary function of a force in physics?

Which of the following is an example of a force that can cause an object to change its direction?

What is the main reason for an object to accelerate down an inclined plane?

Which type of friction prevents motion up to a certain maximum value?

What is the purpose of drawing a free-body diagram?

What is the relationship between the normal force and the coefficient of friction?

What is the formula for the kinetic frictional force?

What is the direction of the acceleration when an object is moving under the influence of a net force?

What is the purpose of resolving forces into components?

What is the property of an object that causes it to continue in its current state of motion?

What is the formula for the static frictional force?

What is the direction of the net force when an object is in equilibrium?

What is the primary difference between mass and weight?

Why do astronauts in orbit around the Earth experience weightlessness?

What is the purpose of solving comparative problems in physics?

What is the relationship between the weight of an object and its mass?

What happens to an object when there is no normal force acting on it?

What is the gravitational acceleration on an object near the Earth's surface?

What is the equation that relates the gravitational force, mass, and gravitational acceleration?

What is the characteristic of the gravitational force acting on an object near the Earth's surface?

What is the net force acting on an object in a state of equilibrium?

When a lift accelerates downwards, what happens to the normal force?

What is the direction of the frictional force acting on an object moving on a surface?

What is the condition for an object to be in equilibrium?

What is the relation between the gravitational force and the distance between two objects?

What is the purpose of drawing a free body diagram?

What is the difference between action and reaction forces?

What happens to the apparent weight of an object when it is in a lift accelerating upwards?

What is the force that prevents relative motion between surfaces up to a certain maximum value?

When resolving forces into components, what is the formula for the x-component of the gravitational force?

What is a common effect of a force on an object?

What is the primary difference between a contact force and a non-contact force?

What is the vector sum of all the forces acting on an object?

What type of force is the force of the Earth's pull on the Moon?