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Chapter 3 Review

Total questions: 50

Worksheet time: 2hrs 40mins

Name
Class
Date
1.

The fixed point on a lever is called the __________.

a)

Bar

b)

Wedge

c)

Fulcrum

d)

Screw

2.

A ___________ is a wheel with a rope wrapped around it that can be used to lift or PULL heavy objects by changing the direction or amount of force.

a)

Lever

b)

Wedge

c)

Pulley

d)

Inclined Plane

3.

Which of the following are examples of inclined planes? (Hint: Two!)

a)

Door

b)

Slide

c)

Flag Pole

d)

Ramp

4.

A __________ is a bar that moves around a fixed point in order to push, pull, or move things.

a)

Pulley

b)

Lever

c)

Wedge

d)

Screw

5.

An __________________ is a flat surface that is raised higher at one end in order to move objects up or down.

a)

Lever

b)

Pulley

c)

Inclined Plane

d)

Wedge

6.

A ___________ is an object that is wide at one end and pointed at the other to help cut or split objects.

a)

Wedge

b)

Screw

c)

Pulley

d)

Wheel & Axle

7.

Which of the following are examples of levers? (Hint: Two!)

a)

Light Switch

b)

Seesaw

c)

Ramp

d)

Flag Pole

8.

Which of the following are examples of wedges? (Hint: two)

a)

Jar lid

b)

Needle

c)

Nail

d)

Hose

9.

Which of the following are examples of screws? (Hint: two!)

a)

Knife

b)

Jar lid

c)

Seesaw

d)

End of a light bulb

10.

Simple machines change the ___________ of a force and the _________ of force needed to do something.

a)

Position

b)

Direction

c)

Amount

d)

Speed

11.

A __________________ is a rod attached to the center of a wheel that is used to make it easier to turn or move objects.

a)

Wedge

b)

Pulley

c)

Inclined Plane

d)

Wheel & Axle

12.

Which of the following are examples of pulleys? (Hint: two!)

a)

Door

b)

Clothes Line

c)

Well

d)

Seesaw

13.

A __________ is an inclined plane wrapped around a small rod used to hold objects together.

a)

Wedge

b)

Pulley

c)

Screw

d)

Wheel & Axle

14.

Which of the following are examples of compound machines? (hint: two)

a)

Wheelbarrow

b)

Door knob

c)

Scissors

d)

Knife

15.

This image shows which of the following simple machines?

a)

Wheel & Axle

b)

Pulley

c)

Screw

d)

Inclined Plane

16.

This image shows which of the following simple machines?

a)

Pulley

b)

Inclined Plane

c)

Wheel & Axle

d)

Lever

17.

A _________ machine is two or more simple machines working together.

a)

Couple

b)

Colored

c)

Compound

d)

Simple

18.

Which of the following is an example of a wheel and axle? (Hint: two)

a)

Shovel

b)

Door knob

c)

Bike wheels

d)

Ladder

19.

This image shows which of the following simple machine?

a)

Lever

b)

Wedge

c)

Screw

d)

Wheel & Axle

20.

This image shows which of the following simple machines?

a)

Wedge

b)

Lever

c)

Screw

d)

Pulley

21.
How much work is produced when 350 N is used to move a car 5 m (W=Fd)?
a)
70 J
b)
1750 J
c)
355 J
d)
175 J
22.

What is effort (input) force?

a)

the force one exerts on a machine

b)

the force which an effort force must overcome in order to do work on an object via a simple machine.

c)

the force the machine exerts on a object

d)

the output work times the input distance

23.
Is this an example of work?
A teacher applies a force to a wall and becomes exhausted.
a)
True
b)
False
24.
What is the equation for mechanical advantage?
a)
MA=input force*output force
b)
MA=output force/input force
c)
MA=input force/output force
d)
MA= output force - input force
25.
if a load of a lever is 100 newtons and the force you apply is 20 newtons, what is your mechanical advantage?
a)
120 N
b)
5 N
c)
2000 N
d)
80 N
26.

the amount of work you do when you exert one Newton of force to move the object one meter

a)

joule

b)

newton

c)

meter

d)

output force

27.

the rate at which work is done

a)

power

b)

work

c)

machine

d)

efficiency

28.
The efficiency of a machine can be increased by reducing __________________________. 
a)
effort
b)
resistance friction
c)
fulcrum
d)
friction
29.

The _________ of a machine is always less than 100%.

a)

mechanical advantage

b)

friction

c)

force

d)

efficiency

30.
All simple machines help make work _________.
a)
harder
b)
smaller
c)
lighter
d)
easier
31.

Is it possible to have a machine in the real world with 110% efficiency?

a)

Yes

b)

No

32.

As a percent, what is the efficiency of a machine that puts out 90 J of work when you put in 100 J of work?

(a)  

33.

Which of the following machines loses the most energy to heat?

a)

50% efficient machine

b)

Output Work = 60 J

Input Work = 100 J

34.

What is the efficiency of a car that has enough fuel to drive 600 miles, but only actually drives 150 miles?

a)

25%

b)

4%

c)

400

d)

.25

35.

Efficiency is a measure of

a)

how much work is done per second

b)

how much work is output versus to how much work is input

c)

how much power is used per second

d)

how much power is output versus how much power is input

36.
How much work is being done with 200 N of force over 426 meters?
a)
85,200 J
b)
45,620 J
c)
90,480 J
d)
62,329 J
37.
If 150 Joules of work is needed to move a box 10 meters, what force was used? 
a)
1500 N
b)
15 N
c)
1.5 N
d)
150 N
38.
Work is done when a weightlifter holds a barbell still above his head.
a)
True
b)
False
39.

You push against the back of your friends car that is stuck. You push and be become very tired, but the car does not move. Did you do work?

a)

Yes, work was done

b)

No, work wasn't done

40.
The amount of work done in a certain amount of time is known as 
a)
work
b)
effort force
c)
resistance force 
d)
power
41.

If you increase your work and decrease your time, you will have

a)

more power

b)

less power

c)

same amount of power

d)

power rating can not be determined

42.

If you have the same work as someone, but in less time

a)

You are more powerful

b)

You are less powerful

c)

You have the same power

43.

Person A and Person B are both using the same amount of work to lift something. Person A takes half as much time to do it. Who has greater power.

a)

Person A

b)

Person B

44.
Force is a _____ or _______
a)
simple    complex
b)
push     pull
c)
up      down
d)
in      out
45.
How much work is done in holding a 15 N sack of potatoes while waiting in line at the grocery store for 3 minutes?
a)
15 J
b)
45 J
c)
0 J
d)
5 J
46.
The more POWER you use to move an object, the more work you do. 
a)
True
b)
False
47.
If 68 W of power is produced in 18 seconds, how much work is done?
a)
1,224 J
b)
0.264 J
c)
3.77 J
d)
12.24 J
48.
How much time is needed to produce 720 Joules of work if 90 watts of power is used? 
a)
0.125 s
b)
8 s
c)
64800 s
d)
80 s
49.
If 68 Joules were necessary to move a 4 Newton crate, how far was the crate moved?
a)
272 m
b)
17 m
c)
4.05 m
d)
272 cm 
50.
The unit used to measure power is the 
a)
Watt
b)
Newton
c)
Joule
d)
Newton*meter

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