Work Power and Energy Physics Practice

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Work, Power, and Energy Physics Practice

Get the work, power, and energy physics practice you need for your test. Generate 10 and 20 question quizzes here and find other useful practice.

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Physics Equation Sheet

Random 10 Questions from the Work, Power, and Energy Test Bank

10 Work Power and Mechanical Energy Questions

1 / 10

Tom pushes a 50 kg box up a 15 meter incline plane by pushing with a force of 100 N. The end result is that the box was lifted 2 meters. What was the efficiency of this simple machine?

32.1%

66.7%

73.1 %

32 %

2 / 10

The picture above is of a(n) ___________________.

lever

pulley

incline plane

3 / 10

Simple machines can't be used to multiply _________________.

Force

Distance

Energy

You cannot create work or energy. In a perfect (ideal) scenario W_in = W_out but it’s impossible for W_outto be more. Since W=(F)(d) you create the equation (F_in)(d_in)=(F_out)(d_out). This last equation shows how you can multiply force or distance

4 / 10

What happens to potential energy as an object falls under ideal conditions?

It increases

It decreases

It stays the same

Mechanical energy stays the same as potential energy gets converted to kinetic energy

Mechanical Energy (PE + KE) stays the same

Potential energy goes down

Kinetic energy goes up

5 / 10

What happens to kinetic energy as an object falls under ideal conditions?

It increases

It decreases

It stays the same

Mechanical energy stays the same as potential energy gets converted to kinetic energy

Mechanical Energy (PE + KE) stays the same

Potential energy goes down

Kinetic energy goes up

6 / 10

Potential energy is dependent on __________________.

location

motion

heat

Location or height which is a type of location

how far you pull the a bow back or how high you lift an object

See types of distance and height in the equations below

Potential energy is equal to the work done, force applied over a distance, to store it (PE = Fd)

Gravitational potential energy is equal to its weight (mass times gravity) lifted a height to store it (GPE = mgh)

7 / 10

Mechanical Energy is composed of ____________.

kinetic energy

potential energy

both potential and kinetic energy

heat energy

Mechanical energy is composed of potential energy plus kinetic energy. Its the total of the moving and what could be released as moving energy.

ME = KE + PE

8 / 10

How much more potential energy do you have when an object is five times higher?

1/5 times

2 times

5 times

25 times

9 / 10

How much potential energy does a 568 N ballerina have when she leaped 0.35 meters off the ground?

6.3 J

20 J

199 J

1990 J

GPE = mgh or GPE = F_wh

you are given weight not mass so use this form:

GPE = F_wh = (568)(0.35) = 198.8 J

10 / 10

How much work would a 75 kg student do to climb up a ladder 9 meters?

0 J

675 J

3250 J

6615 J

You must lift your weight as the force when going up

F_w = mg = (75)(9.8) = 735 N

W = Fd = (735)(9) = 6615 J

Your score is

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Random 20 Questions from the Work, Power, and Energy Test Bank

20 Work Power and Mechanical Energy Questions

1 / 20

What is the efficiency of 4 meters ramp used to lift a 1400 N sled full of toys 1 meter off the ground pushing with a force of 500 N?

110 %

45 %

70 %

62 %

2 / 20

What is the ideal mechanical advantage when a ramp of 4 meters is used to lift a 1400 N sled full of toys 1 meter off the ground pushing with a force of 500 N?

350

3 / 20

What length of ramp would you ideally have to use to raise an 815 N box a height of 2.10 m using a force of 165 N?

10.37 m

9.81 m

0.43 m

13.22 m

4 / 20

What is the Actual Mechanical Advantage when 300 N of force is required to lift a 3000 N object?

0.1

5 / 20

Joe is attempting to lift a 3000 N motorcycle into a trailer 1.5 meters off the ground using a pulley system. If Joe applies 300 N of force, what is the ideal distance he would pull on his side of the rope?

0.0005 m

15 m

10 m

450

6 / 20

A 460 N box is hoisted above a truck by John who applies 60 N of force. What is the actual mechanical advantage of the pulley system?

0.13

7.67

27600

2760

7 / 20

A 460 N box is hoisted above a truck by John who applies 60 N of force. What is the actual mechanical advantage of the pulley system?

0.13

7.67

27600

2760

8 / 20

John pushes a box up a ramp using a 10 m plank. The box moves a vertical distance of 2 m and weighs 500 N, ideally with how much force must he push?

100 N

0.01 N

10000 N

250 N

9 / 20

Which is a simple machine consisting of a bar or plank that turns around a pivot point?

lever

pulley

incline plane

10 / 20

When energy is lost from a system it is most likely ________________.

destroyed

converted to heat

converted to mechanical energy

You cannot create work or energy. In a perfect (ideal) scenario W_in = W_out but it’s impossible for W_outto be more. In real situations W_outis less because heat is lost.

11 / 20

When energy is lost from a simple machine which of the following must be less

work output

work input

distance output

force output

You cannot create work or energy. In a perfect (ideal) scenario W_in = W_out but it’s impossible for W_outto be more. In real situations W_outis less because heat is lost.

12 / 20

What happens to potential energy as an object falls under ideal conditions?

It increases

It decreases

It stays the same

Mechanical energy stays the same as potential energy gets converted to kinetic energy

Mechanical Energy (PE + KE) stays the same

Potential energy goes down

Kinetic energy goes up

13 / 20

What happens to kinetic energy as an object falls under ideal conditions?

It increases

It decreases

It stays the same

Mechanical energy stays the same as potential energy gets converted to kinetic energy

Mechanical Energy (PE + KE) stays the same

Potential energy goes down

Kinetic energy goes up

14 / 20

Mechanical Energy is composed of ____________.

kinetic energy

potential energy

both potential and kinetic energy

heat energy

Mechanical energy is composed of potential energy plus kinetic energy. Its the total of the moving and what could be released as moving energy.

ME = KE + PE

GPE = mgh or GPE = F_wh

You are given weight not mass so use this form:

GPE = mgh = (50)(3.5) = 175 J

15 / 20

How much potential energy is in a 50kg boulder 3.5m off the ground?

1.43 J

1715 J

3862 J

6732 J

16 / 20

Sergio pushed a box with 50 Newtons of force forward. When it did not move he pushed the box even harder with 100 Newtons of force but the box still did not move. When did Sergio do more work?

When he pushed with a force of 50 N

When he pushed with a force of 100 N

Neither

W = Fd

If you do not move the object, you have done no work no matter how much force you apply

17 / 20

How much work would you have done if you pushed on a 2100 kg car with a force of 210N that did not move?

0 J

10 J

3250 J

441000 J

W = Fd

You have to move the object in the direction of force to do work. No work is done if the object does not move.

18 / 20

How much work would a 75 kg student do to climb up a ladder 9 meters?

0 J

675 J

3250 J

6615 J

You must lift your weight as the force when going up

F_w = mg = (75)(9.8) = 735 N

W = Fd = (735)(9) = 6615 J

19 / 20

A student lifts a physics book applying a force equal to is 10N weight a distance of 3m up. How much work did the student do on the book?

0 J

3.3 J

30 J

3000 J

Work equals force times distance (W = Fd) and the force is the weight of the book that is lifted up

W = Fd = (10)(3) = 20 N

20 / 20

How much work is done when a force of 50N forward is applied to move a box 6 meters in the same direction?

0 J

8.3 J

50 J

300 J

W = Fd

W = (50)(6) = 300 J

Your score is

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StickMan Physics Home Page
Work, Power, and Energy Content Page
Stickman Physics Table of Contents: Use the search bar or click here to easily find a unit or topic
Physics Equation Sheet: commonly used equations, variables, and units
Rule of Ones: analyzing equations to determine how other variables change
Holdensclass.com: Video walk-through of Many Physics Concepts