Physics Chapter: Work and Energy
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Physics Chapter: Work and Energy

Test your understanding of work and energy concepts, including the definition of work, the constant force equation, and the unit of work. Apply your knowledge to solve problems and identify the conditions for which the work done by a constant force is valid.

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Questions and Answers

What is the condition for which the work done by a constant force is valid?

When the force and displacement are in the same direction

Which type of energy is associated with an object in motion?

Kinetic energy

What is the direction of the force vector component when it does negative work on an object?

Opposite direction to the displacement

What is the principle that states that the total energy of an isolated system remains constant?

<p>Principle of conservation of energy</p> Signup and view all the answers

What is the unit of work done in a system?

<p>Joule</p> Signup and view all the answers

Which equation relates the work done by a force to the energy transferred to an object?

<p>W = F × d × cosθ</p> Signup and view all the answers

What is the fundamental principle that states that the total amount of energy remains constant, regardless of transformations and transfers?

<p>The principle of energy conservation</p> Signup and view all the answers

Which type of energy is associated with the motion of an object with mass and velocity?

<p>Kinetic energy</p> Signup and view all the answers

What is the relationship between the change in potential energy and the work done by a particular force?

<p>The change in potential energy is equal to the negative of the work done by the force</p> Signup and view all the answers

What is the principle that states that the net work done on an object is equal to the change in the object's kinetic energy?

<p>The work-energy principle</p> Signup and view all the answers

What type of energy is stored in elastic materials or objects, such as a rubber band or a spring?

<p>Elastic potential energy</p> Signup and view all the answers

What happens to the total mechanical energy of a system when only conservative forces do work?

<p>It remains constant</p> Signup and view all the answers

What is the direction of the force component that does negative work on an object?

<p>In the opposite direction of the displacement</p> Signup and view all the answers

If a force of 50 N is applied to an object, and it moves a distance of 2 m, what is the work done on the object?

<p>100 J</p> Signup and view all the answers

What is the net work done on a 20 kg object if a constant force of 80 N is applied to it, and it moves a distance of 1.2 m, with an opposing friction force of 10 N?

<p>96 J</p> Signup and view all the answers

What is the unit of energy transferred when a force is applied to an object?

<p>Joule</p> Signup and view all the answers

What determines the amount of work done on an object when a force is applied to it?

<p>Both the size of the force and the distance of the displacement</p> Signup and view all the answers

What is the characteristic of a force that does zero work on an object?

<p>It has no vector component in the direction of the displacement</p> Signup and view all the answers

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