Work Power Energy and Simple Machines Unit Assessment

Work, Power, Energy, and Simple Machines Unit Assessment

Take our work, power, energy, and simple machines unit assessment quizzes. Follow links back to lessons for support your weakest assessment.

Work and Power Quiz

Do you know your work and power?

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1 / 9

What is the unit of energy?

Joules (J) is the unit for energy (ME,PE,KE,Heat, or work)

Work is the transformation of one form of energy to another.

2 / 9

What is the unit of power?

Watt is the unit of power which is a Joule per second W = F/d

3 / 9

What is the unit of work?

The joule is the unit of work and all of the energies (ME, KE, PE, Heat)

4 / 9

What is the power output when it takes a force of 50N forward is applied to move a box 6 meters in the same direction in 6 seconds?

300 W

50 W

8.3 W

0 W

5 / 9

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

300 J

50 J

0 J

8.3 J

W = Fd

W = (50)(6) = 300 J

6 / 9

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

441000 J

3250 J

10 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.

7 / 9

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

3000 J

30 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

8 / 9

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

6615 J

0 J

3250 J

675 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

9 / 9

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 100 N

Neither

When he pushed with a force of 50 N

W = Fd

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

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Mechanical Energy Quiz

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Mechanical Energy Quiz

Do you know your mechanical energy?

Take our quiz to find out

1 / 14

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

2 / 14

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

3 / 14

What happens to mechanical 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

4 / 14

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)

5 / 14

Kinetic energy is dependent on __________________.

location

motion

heat

Movement: see how KE has velocity in the equation below

KE = ½ mv²

GPE = mgh or GPE = F_wh

You are given weight not mass so use this form:

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

6 / 14

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

1.43 J

1715 J

3862 J

6732 J

7 / 14

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

8 / 14

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 / 14

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

10 / 14

When energy is lost from the system its lost as _______________.

kinetic energy

potential energy

both potential and kinetic energy

heat energy

Heat is not the reason for a cars engine and is a form that mechanical energy is converted to when not going into movement

11 / 14

How much kinetic energy does a 30 kg boar have when running 6 m/s?

90 J

540 J

1800 J

5 J

12 / 14

How much does kinetic energy change when the velocity of an object doubles?

0 times

2 times

4 times

1/2 times

1/4 times

13 / 14

If a car has a mass of 750 kg, how much force is required to stop the car if it was traveling 12.5 m/s and took 10 m to stop?

2434 N

5859 N

12230 N

1460 N

14 / 14

A pool ball is flung off of a 0.68 m high table and the ball hits the floor with a speed of 6.0 m/s. How fast was the ball moving when it left the pool table?

3.23 m/s

4.76 m/s

6.34 m/s

22.31 m/s

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Simple Machine Quiz

Simple Machines Quiz

Do you know your simple machines?

Take our quiz to find out

1 / 14

Simple machines can't be used to multiply _________________.

Force

Energy

Distance

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

2 / 14

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

work output

distance output

force output

work input

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.

3 / 14

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

converted to mechanical energy

converted to heat

destroyed

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.

4 / 14

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

incline plane

lever

pulley

5 / 14

The picture above is of a(n) ___________________.

pulley

incline plane

lever

6 / 14

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

10000 N

250 N

0.01 N

7 / 14

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?

27600

2760

7.67

0.13

8 / 14

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

2760

27600

7.67

9 / 14

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

450

10 m

15 m

10 / 14

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

0.1

11 / 14

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

12 / 14

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

13 / 14

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?

45 %

62 %

110 %

70 %

14 / 14

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?

73.1 %

32.1%

66.7%

32 %

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