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Energy Work Power and Simple Machines

Total questions: 36

Worksheet time: 18mins

Name
Class
Date
1.

Use the equation, mechanical energy = gravitational potential energy + kinetic energy. What is the mechanical energy of the roller coaster that Blake is riding, if it has 90,000 J of GPE and 32,000 J of KE?

a)

58000 J

b)

288000000 J

c)

122000 J

d)

Blake loves roller coasters!

2.

Use the equation, KE = 1/2mv2 to answer the following question. An 18 kg bicycle carrying a 62 kg girl name Christina is traveling at a speed of 7 m/s. What is the kinetic energy of the girl and bicycle?

a)

1960 J

b)

1519 J

c)

3047 J

d)

Christina doesn't care!

3.

Use the equation, GPE = mgh to answer the question. A 90 kg ceiling light is suspended 4 m above the floor at Mrs. Dykes desk. What is the gravitational potential energy?

a)

3600 J

b)

360 J

c)

528.8 J

d)

It fall and hits Mrs. Dykes

4.

Energy in the form of motion is _____ energy.

a)

chemical

b)

thermal

c)

potential

d)

kinetic

5.

A rock at the edge of a cliff has _____ energy because of its position.

a)

mechanical

b)

elastic

c)

potential

d)

kinetic

6.

According to the law of conservation of energy, energy _____.

a)

can be created or destroyed

b)

is a nonrenewable resource

c)

cannot be created or destroyed

d)

comes form Thor's Hammer!

7.

_____ energy is the total potential and kinetic energy is a system.

a)

Mechanical

b)

Elastic

c)

Potential

d)

Kinetic

8.

The kinetic energy of an object increases as its ______ increases.

a)

gravitational energy

b)

potential energy

c)

specific heat

d)

velocity

9.

The SI unit for energy is the _____.

a)

calorie

b)

joule

c)

meter per second

d)

kilogram

10.

Energy is the ability to cause change.

a)

True

b)

False

11.

When you ride a playground swing, your potential energy is greatest at the lowest point.

a)

True

b)

False

12.

Lowering an object increases its potential energy.

a)

True

b)

False

13.

Energy doesn't have to involve motion.

a)

True

b)

False

14.

Energy from the sun and energy from food are just different forms of the same thing.

a)

True

b)

False

15.

For the picture, which type of lever is shown?

a)

First

b)

Second

c)

Third

16.

For the picture with of the following is an example of this class of lever?

a)

Wheel Barrow

b)

Broom

c)

See Saw

17.

For the picture, which type of lever is shown?

a)

First

b)

Second

c)

Third

18.

Which of the following is an example of this class of lever?

a)

Wheel Barrow

b)

Scissors

c)

Broom

19.

A device that does work with only one movement and changes the size or direction of a force is a(n) _____.

a)

compound machine

b)

simple machine

c)

effort machine

d)

efficiency

20.

The rate at which work is done is _____.

a)

efficiency

b)

mechanical advantage

c)

power

d)

work

21.

Use the equation d = w ∕ f. How far is a 20 N force applied to accomplish 1000 J of work?

a)

20,000 m

b)

2000 m

c)

50 m

d)

0.02 m

22.

Use the equation p = w ∕ t. A motor pushes a car with a force of 90 N for 1500 m in 25 s. How powerful is the motor?

a)

2 W

b)

0.7 W

c)

400 W

d)

5400 W

23.

Use the equation F = w ∕ d. How much force does is take to do 100 J of work across 5 m?

a)

20 N

b)

500 N

c)

0.05 N

d)

200 N

24.

Use the equation MA = output force ∕ input force. What is the mechanical advantage of a lever with an input 15 N force and an output force of 90 N?

a)

1000

b)

6

c)

0.2

d)

20

25.

Use the equation MA = length ∕ height. What is the mechanical advantage of an inclined plane that is 5 m high and 40 m long?

a)

200

b)

0.1

c)

8

d)

10

26.

Which pulley system has a mechanical advantage of three?

a)

A

b)

B

c)

C

d)

D

e)

E

27.

Which pulley would be most beneficial in comparison to the other systems to lift an object?

a)

A

b)

B

c)

C

d)

D

e)

E

28.

Which of Newton's Laws is represented by a trampoline pushing back on you and sending you into the air?

a)

1st

b)

2nd

c)

3rd

d)

4th

29.

You push your little brother on a sled and he quickly goes down the hill. You father on a sled and he goes slowly down the hill. This scenario is related to which of Newton's Laws.

a)

1st

b)

2nd

c)

3rd

d)

4th

30.

What does the slope of the line between any two points represent?

a)

Speed of the student

b)

Distance of the student

c)

The students displacement

d)

The students acceleration

31.

A 2 kg box of mass is being pushed horizontally on a smooth surface by a 10 N force for 6 m. What is the work done on the box by the 10 N force?

a)

12 J

b)

60 J

c)

48 J

d)

120 J

32.

A 2 kg box of mass is lifted diagonally from point A to point B as shown. Given that the acceleration due to gravity is 10 m/s2 , wha tis the gravitational potential energy gained by the box?

a)

20 J

b)

60 J

c)

80 J

d)

100 J

33.

A block made from steel fall from position 1 to position 2 as shown. How much potential energy is lost during the process? (g= 10 m/s, mass of the steel = 200 kg)

a)

12800 J

b)

16000 J

c)

25600 J

d)

32000 J

34.

What is the IMA of the ramp in the figure?

a)

.333

b)

3

c)

4

d)

2

35.

What is Machine A:

a)

Pulley

b)

Lever

c)

Wedge

d)

Wheel and Axel

36.

What is Machine B:

a)

Pulley

b)

Lever

c)

Wedge

d)

Wheel and Axel