Gr 11 Physical Sciences: Ch 2.1 Force

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson
Download our mobile app to listen on the go
Get App

Questions and Answers

What is a force?

  • A force is a type of energy.
  • A force is anything that can cause a change to objects. (correct)
  • A force is a type of motion.
  • A force is a type of speed.

What is an example of a contact force?

  • The force used to push or pull objects. (correct)
  • The force of gravity acting on the Moon.
  • The force of magnetism between two magnets.
  • The force of electricity between two protons.

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

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

What is the resultant force?

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

What type of force is the normal force?

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

What is the direction of the normal force?

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

What is the friction force?

<p>A force that opposes the motion of an object in contact with a surface. (A)</p> Signup and view all the answers

What is the direction of the friction force?

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

What determines the magnitude of the frictional force?

<p>Both the nature of the surfaces in contact and the magnitude of the normal force (B)</p> Signup and view all the answers

What is the difference between static and kinetic friction?

<p>Static friction is present when an object is not moving, while kinetic friction is present when an object is moving (A)</p> Signup and view all the answers

What is the coefficient of friction?

<p>A constant that depends on the nature of the surfaces in contact (D)</p> Signup and view all the answers

What is the formula for the maximum static frictional force?

<p>$f_{max,s} = \mu_s N$ (A)</p> Signup and view all the answers

What is the purpose of a force diagram?

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

What is the formula for the x-component of a force $F$ at an angle $\theta$?

<p>$F_{gx} = F_g \sin(\theta)$ (C)</p> Signup and view all the answers

How do you find the resultant force?

<p>By drawing a free body diagram and using vector addition (C)</p> Signup and view all the answers

What is the purpose of resolving forces into components?

<p>To simplify the calculation of the resultant force (C)</p> Signup and view all the answers

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

<p>It can cause a change to an object without physical contact (B)</p> Signup and view all the answers

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

<p>A force that balances the gravitational force pulling the object down (B)</p> Signup and view all the answers

What is the direction of the friction force acting on an object?

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

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

<p>A contact force requires physical contact, while a non-contact force does not (A)</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 (C)</p> Signup and view all the answers

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

<p>Equal to the gravitational force pulling the object down (C)</p> Signup and view all the answers

What is a characteristic of force as a vector quantity?

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

What is the main reason for the difference in the coefficient of friction for static and kinetic friction?

<p>The surfaces in contact are deformed differently for static and kinetic friction (C)</p> Signup and view all the answers

A force of 50 N is applied to an object at an angle of 30° to the horizontal. What is the y-component of the force?

<p>43.3 N (C)</p> Signup and view all the answers

A rope is used to lift a heavy object. What type of force is present in the rope?

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

A force diagram is a graphical representation of all the forces acting on an object. What is the main purpose of a force diagram?

<p>To visualize and analyze the forces acting on an object (A)</p> Signup and view all the answers

A block is placed on a horizontal surface. What is the direction of the normal force acting on the block?

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

A car is moving up an inclined plane. What is the main reason for the normal force being less than the weight of the car?

<p>The normal force is not acting perpendicular to the inclined plane (C)</p> Signup and view all the answers

A force of 20 N is acting at an angle of 60° to the horizontal. What is the x-component of the force?

<p>17.3 N (A)</p> Signup and view all the answers

A free-body diagram is a graphical representation of an object and all the forces acting on it. What is the main advantage of using a free-body diagram?

<p>It helps to visualize and analyze the forces acting on an object (A)</p> Signup and view all the answers

What is the main purpose of resolving forces into components?

<p>To simplify calculations involving inclined planes (D)</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 can vary up to a maximum value dependent on the normal force (C)</p> Signup and view all the answers

What is the benefit of using a free-body diagram?

<p>It provides a clear visual representation of all the forces acting on an object (C)</p> Signup and view all the answers

What is the formula for the kinetic frictional force?

<p>f_k = μ_k N (A)</p> Signup and view all the answers

What is the direction of the tension force in an object providing support?

<p>The direction of the force is parallel to the object's surface (C)</p> Signup and view all the answers

What is the purpose of a force diagram?

<p>To provide a visual representation of all the forces acting on an object (A)</p> Signup and view all the answers

What is the effect of the angle of inclination on the normal force?

<p>The normal force decreases as the angle of inclination increases (B)</p> Signup and view all the answers

What is the formula for the y-component of a force F at an angle θ?

<p>F_gy = F_g cos(θ) (B)</p> Signup and view all the answers

What is the main purpose of classifying forces as contact or non-contact forces?

<p>To understand the nature of the force and its interaction with objects (B)</p> Signup and view all the answers

Which of the following is an example of a non-contact force that can cause a change in the shape of an object?

<p>Gravity, such as the Earth's pull on the Moon (D)</p> Signup and view all the answers

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

<p>The normal force balances the gravitational force (C)</p> Signup and view all the answers

What is a characteristic of the friction force?

<p>It opposes the motion of an object in contact with a surface (A)</p> Signup and view all the answers

What is the significance of the vector nature of force?

<p>It enables us to determine the direction of the force (C)</p> Signup and view all the answers

What is the resultant force responsible for?

<p>Having the same effect as all the individual forces acting together (A)</p> Signup and view all the answers

Why are fundamental principles learned in physics applicable to different forces?

<p>Because forces have the same underlying principles (B)</p> Signup and view all the answers

A force F is applied to an object at an angle θ to the horizontal. What is the direction of the x-component of the force?

<p>Parallel to the horizontal (A)</p> Signup and view all the answers

A block is placed on a surface with a coefficient of kinetic friction μk. If the block starts moving, what happens to the frictional force?

<p>It decreases to a value less than the maximum static frictional force (B)</p> Signup and view all the answers

What is the main advantage of using a free-body diagram?

<p>It provides a clear representation of all forces acting on an object (A)</p> Signup and view all the answers

A rope is used to lift a heavy object. What type of force is present in the rope?

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

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

<p>The coefficient of friction is directly proportional to the normal force (C)</p> Signup and view all the answers

A car is moving up an inclined plane. What happens to the normal force?

<p>It decreases and becomes less than the weight of the car (D)</p> Signup and view all the answers

What is the main purpose of resolving forces into components?

<p>To analyze the forces acting on an object in a particular direction (A)</p> Signup and view all the answers

What is the main reason for the difference in the coefficient of friction for static and kinetic friction?

<p>The difference in the adhesive properties of the surfaces (D)</p> Signup and view all the answers

A force is applied to an object at an angle of 45° to the horizontal. If the vertical component of the force is 10 N, what is the magnitude of the force?

<p>10√2 N (A)</p> Signup and view all the answers

Which of the following statements about the resultant force is false?

<p>The resultant force is always greater than the individual forces. (A)</p> Signup and view all the answers

A block is placed on a surface with a coefficient of friction of 0.5. If the normal force is 20 N, what is the maximum static frictional force?

<p>10 N (B)</p> Signup and view all the answers

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

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

A force is applied to an object at an angle of 30° to the horizontal. If the horizontal component of the force is 20 N, what is the magnitude of the force?

<p>20√3 N (A)</p> Signup and view all the answers

Which of the following is a characteristic of both contact and non-contact forces?

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

A force is applied to an object at an angle of 60° to the horizontal. If the vertical component of the force is 15 N, what is the horizontal component of the force?

<p>15/√3 N (C)</p> Signup and view all the answers

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

<p>It does not have to touch an object to cause a change. (B)</p> Signup and view all the answers

More Like This

Use Quizgecko on...
Browser
Open
Browser
Browser