High School Physics : Energy and Work

Study concepts, example questions & explanations for High School Physics

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Example Questions

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Example Question #61 : Energy And Work

A cat knocks a  toy mouse across the floor with  of force. If the toy travels , how much work did the cat do?

Possible Answers:

Correct answer:

Explanation:

The relationship between work, force and distance is:

We are given the value for the force and the distance that the toy travels. Using these values, we can find the work done by the cat. Note that the mass of the toy is not relevant for this calculation.

Example Question #3 : Calculating Work

A cat knocks a  toy mouse across the floor. If it travels  and the cat does  of work, how much force did the cat exert on the mouse?

Possible Answers:

Correct answer:

Explanation:

The relationship between work, force and distance is:

We are given the value for the work done by the cat and the distance that the toy travels. Using these values, we can find the force on the toy. Note that the mass of the toy is not relevant for this calculation.

Example Question #11 : Sat Subject Test In Physics

A crate is pushed across the floor. If of force was used to achieve this motion, how much work was done?

Possible Answers:

Correct answer:

Explanation:

The formula for work is:

Given the values for force and distance, we can calculate the work done.

Note that no work is done by the force of gravity or the weight of the box, since the vertical position does not change.

Example Question #9 : Calculating Work

Ryan pushes a  filing cabinet  across the floor, doing  of work. How much force is he applying to the cabinet?

Possible Answers:

Correct answer:

Explanation:

Work is the product of force times a distance:

We are given the work and the distance traveled, allowing us to solve for the force. The mass of the cabinet is not necessary information.

Example Question #2 : Calculating Work

A 1500kg rocket has a net propulsion force of 500N. Over a short period of time, the rocket speeds up uniformly from an initial velocity of  to a final velocity of . Assume that the mass of the rocket remains constant even though it is burning fuel and that the net force is along the direction of travel. What is the net work done on the rocket in kJ?

Possible Answers:

None of these

Correct answer:

Explanation:

Use the data given to calculate the kinetic energy of the rocket at the two different velocities. Then find the amount of work done using the following equation: 

Kinetic energy of the rocket at the two velocities:

The change in the kinetic energy at the two velocities:

 

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