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?

  • 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?

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

    What is the normal force?

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

    What is a characteristic of a force?

    <p>It has both magnitude and direction (A)</p> Signup and view all the answers

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

    <p>Contact force (C)</p> Signup and view all the answers

    What is the symbol often used to represent force?

    <p>( \vec{F} ) (A)</p> Signup and view all the answers

    What is the primary function of friction forces?

    <p>To oppose the motion of an object (A)</p> Signup and view all the answers

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

    <p>It makes the object feel heavier. (A)</p> Signup and view all the answers

    What is the difference between static and kinetic friction?

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

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

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

    What is the coefficient of friction?

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

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

    <p>A force equal to zero. (C)</p> Signup and view all the answers

    What is the purpose of a force diagram?

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

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

    <p>Frictional force. (D)</p> Signup and view all the answers

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

    <p>The object of interest (C)</p> Signup and view all the answers

    What is the coefficient of friction?

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

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

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

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

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

    What is Newton's First Law of Motion?

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

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

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

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

    <p>F = ma (B)</p> Signup and view all the answers

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

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

    What is the purpose of resolving forces into components?

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

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

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

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

    <p>Upward (D)</p> Signup and view all the answers

    What is the purpose of drawing a free body diagram?

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

    What is the unit of measurement for weight?

    <p>Newtons (N) (A)</p> Signup and view all the answers

    Why do astronauts in space experience weightlessness?

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

    What is the relationship between weight and mass?

    <p>Weight is directly proportional to mass (A)</p> Signup and view all the answers

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

    <p>It is the same for all objects (C)</p> Signup and view all the answers

    What is the unit of measurement for mass?

    <p>Kilograms (kg) (C)</p> Signup and view all the answers

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

    <p>Weightlessness (A)</p> Signup and view all the answers

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

    <p>Comparative problems (A)</p> Signup and view all the answers

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

    <p>F = mg (C)</p> Signup and view all the answers

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

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

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

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

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

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

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

    <p>Perpendicular to the surface. (B)</p> Signup and view all the answers

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

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

    What is the nature of force?

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

    What is the primary function of a force in physics?

    <p>To cause a change in an object's motion. (B)</p> 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?

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

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

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

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

    <p>Static friction (D)</p> Signup and view all the answers

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

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

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

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

    What is the formula for the kinetic frictional force?

    <p>f_k = μ_k N (B)</p> 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?

    <p>Parallel to the net force (D)</p> Signup and view all the answers

    What is the purpose of resolving forces into components?

    <p>To simplify calculations involving inclined planes (D)</p> Signup and view all the answers

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

    <p>Inertia (B)</p> Signup and view all the answers

    What is the formula for the static frictional force?

    <p>f_s = μ_s N (D)</p> Signup and view all the answers

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

    <p>Zero (C)</p> Signup and view all the answers

    What is the primary difference between mass and weight?

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

    Why do astronauts in orbit around the Earth experience weightlessness?

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

    What is the purpose of solving comparative problems in physics?

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

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

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

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

    <p>It becomes weightless. (C)</p> Signup and view all the answers

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

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

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

    <p>F = mg (B)</p> Signup and view all the answers

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

    <p>It is the same for all objects. (C)</p> Signup and view all the answers

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

    <p>Zero (D)</p> Signup and view all the answers

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

    <p>It decreases (D)</p> Signup and view all the answers

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

    <p>Parallel to the surface (C)</p> Signup and view all the answers

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

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

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

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

    What is the purpose of drawing a free body diagram?

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

    What is the difference between action and reaction forces?

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

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

    <p>It increases (A)</p> Signup and view all the answers

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

    <p>Static friction (B)</p> Signup and view all the answers

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

    <p>Fgx = Fg sin(θ) (C)</p> Signup and view all the answers

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

    <p>Changing the object's shape (C)</p> Signup and view all the answers

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

    <p>The need for physical contact (B)</p> Signup and view all the answers

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

    <p>The resultant force (D)</p> Signup and view all the answers

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

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

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

    <p>Perpendicular to the surface (D)</p> Signup and view all the answers

    What is the primary function of forces in physics?

    <p>To cause a change in objects (C)</p> Signup and view all the answers

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

    <p>All of the above (D)</p> Signup and view all the answers

    What is a characteristic of force?

    <p>It has both magnitude and direction (D)</p> Signup and view all the answers

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

    <p>Mass (D)</p> Signup and view all the answers

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

    <p>The object is in free fall (C)</p> Signup and view all the answers

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

    <p>Comparative problems (A)</p> Signup and view all the answers

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

    <p>F = m × g (B)</p> Signup and view all the answers

    Why do astronauts in space experience weightlessness?

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

    What is the relationship between weight and mass?

    <p>Weight is proportional to mass (B)</p> Signup and view all the answers

    What is the primary difference between mass and weight?

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

    What is the purpose of solving comparative problems?

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

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

    <p>The normal force between the surfaces (B)</p> 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?

    <p>To identify the forces acting on an object (C)</p> 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?

    <p>The net force is zero (B)</p> Signup and view all the answers

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

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

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

    <p>The gravitational force parallel to the slope (D)</p> Signup and view all the answers

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

    <p>Zero (D)</p> Signup and view all the answers

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

    <p>Greater than its true weight (D)</p> 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?

    <p>It simplifies the calculations (B)</p> Signup and view all the answers

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

    <p>To calculate the acceleration of an object (A)</p> Signup and view all the answers

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

    <p>Frictional force (A)</p> Signup and view all the answers

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

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

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

    <p>Along the line connecting the centers of the objects (A)</p> Signup and view all the answers

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

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

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

    <p>It helps to identify the forces acting on an object (C)</p> 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?

    <p>In the direction of the net force (D)</p> Signup and view all the answers

    What is the purpose of resolving forces into components?

    <p>To simplify the analysis of complex forces (C)</p> Signup and view all the answers

    What is the formula for the maximum static frictional force?

    <p>f_s = μ_s N (D)</p> Signup and view all the answers

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

    <p>Perpendicular to the surface (B)</p> Signup and view all the answers

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

    <p>It decreases the apparent weight (C)</p> Signup and view all the answers

    What is the purpose of a free-body diagram?

    <p>To show the forces acting on an object (A)</p> 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?

    <p>2.5 m/s² (B)</p> 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?

    <p>20 N (C)</p> 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?

    <p>250 N (D)</p> 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?

    <p>2.5 m/s² (D)</p> 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?

    <p>4.5 m/s² (B)</p> 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?

    <p>2.5 m/s² (C)</p> 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?

    <p>150 N (A)</p> 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?

    <p>40 N (B)</p> 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?

    <p>25 N (D)</p> 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?

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

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

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

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

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

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

    <p>Parallel to the surface. (D)</p> 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?

    <p>Down the slope. (B)</p> Signup and view all the answers

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

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

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

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

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

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

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

    <p>To represent the forces acting on an object. (D)</p> 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?

    <p>Down the slope. (D)</p> 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?

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

    What is the primary difference between mass and weight?

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

    What is the condition for an object to experience weightlessness?

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

    What is the purpose of solving comparative problems?

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

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

    <p>F = mg (D)</p> 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?

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

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

    <p>Mass (D)</p> Signup and view all the answers

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

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

    What is the method for solving comparative problems?

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

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

    <p>The necessity of physical contact (C)</p> Signup and view all the answers

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

    <p>The force used to push or pull objects (A)</p> 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?

    <p>2 N (A)</p> Signup and view all the answers

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

    <p>Perpendicular to the gravitational force (C)</p> Signup and view all the answers

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

    <p>Towards the magnet (D)</p> Signup and view all the answers

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

    <p>Physical contact (D)</p> Signup and view all the answers

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

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

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