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PSH unit 7 section 4

Total questions: 50

Worksheet time: 2hrs 52mins

Name
Class
Date
1.
Identify this simple machine
a)
Lever
b)
Wheel & Axle
c)
Inclined Plane
d)
Screw
2.
Two examples of a pulley...
a)
knife & axe blade
b)
lightbulb & screw
c)
flagpole hoist & window blinds
d)
catapult & teeter totter
3.
Which of the following does a simple machine do?
a)
allows the users to apply less force over a longer distance
b)
reduce the amount of force needed to do work
c)
change the direction of the applied force
d)
all of the above
4.
Which is an example of someone using a simple machine to do work?
a)
a boy runs across a football field
b)
a banker counts money
c)
a mother pushes a stroller up a ramp
d)
a girl eats a sandwich
5.
The device used to raise a flag up a flag pole is an example of a 
a)
wheel and axle 
b)
lever
c)
inclined plane 
d)
pulley 
6.
An inclined plane wrapped around a rod forms this simple machine 
a)
lever
b)
pulley
c)
screw
d)
wedge 
7.
A simple machine that consists a rigid bar that pivot about a fixed point
a)
lever
b)
pulley
c)
wheel and axle
d)
fulcrum 
8.
A seesaw is an example of a  
a)
wedge
b)
lever 
c)
inclined plane 
d)
pulley 
9.
Stairs
a)
wedge
b)
pulley
c)
inclined plane
d)
wheel and axle
10.
This device
a)
wedge
b)
lever
c)
incline plane
d)
wheel and axle
11.
Name this simple machine. 
a)
Wheel and Axle
b)
Lever
c)
Pulley
d)
Wedge
12.
What is effort (input) force?
a)
the force required by a machine in order to accomplish work (the force you put on the 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
13.
What is resistance (output) force?
a)
the force required by a machine in order to accomplish work (the force you put on the 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
14.
Using a lever, Joe is able to lift a 10,000 N car off of the ground with a force of 1000 N. What is the mechanical advantage of the lever?
a)
1
b)
10
c)
100
d)
1000
15.

work is equal to _____________ multiplied by distance

a)

power

b)

friction

c)

force

d)

acceleration

16.

How can you reduce the amount of force required to lift an object using an inclined plane (ramp)?

a)

increase the length of the ramp

b)

increase the height of the ramp

c)

decrease the length of the ramp

17.
1. A book weighing 1.0 newton is lifted 2 meters.  How much work was done?
a)
2 J
b)
0.5 J
18.
A force of 15 newtons is used to push a box along the floor a distance of 3 meters.  How much work was done?
a)
3 J
b)
45 J
19.
It took 50 joules to push a chair 5 meters across the floor. With what force wast the chair pushed?
a)
250N
b)
10N
20.
A force of 100 newtons was necessary to lift a rock.  A total of 150 joules of work was done.  How far was the rock lifted?
a)
1.5m
b)
15,000 m
21.
It took 500 newtons of force to push a car 4 meters.  How much work was done?
a)
2,000 J
b)
125 J
22.
A young man exerted a force of 9,000 newtons on a stalled car but was unable to move it.  How much work was done?
a)
9,000 J
b)
0 J= No work
23.
A set of pulleys is used to lift a piano weighing 1,000 newtons.  The piano lifted 3 meters in 60 seconds  How much power is used?
a)
16.67 watts
b)
50 watts
24.
How much power is used if a force of 35 newtons is used to push a box a distance of 10 meters in 5 seconds?
a)
70 watts
b)
1750 watts
25.
What is the power of a kitchen blender if it can perform 3,750 joules of work in 15 seconds?
a)
56, 250 watts
b)
250 watts
26.
How much work is done using a 500 watt microwave oven for 5 minutes?
a)
150,000 J
b)
2500 J
27.
How much work is done using a 60 watt light bulb for 1 hour?
a)
60 J
b)
216,000 J
28.

The equation for work is

a)

work = power x mass

b)

work = power / time

c)

work = force x distance

d)

work = distance x time

29.

The equation for POWER is

a)

power = mass x time

b)

power = work / time

c)

power = time / work

d)

power = work x time

30.

The product of the net force on an object and the distance through which the object is moved

a)

joule

b)

power

c)

work

d)

energy

31.

_______________ is done when a force acts on an object and the object moves in the direction of the force.

a)

Work

b)

Kinetic energy

c)

Watt

d)

Joule

32.

The unit for work (aka Newton-meter)

a)

Watt

b)

Power

c)

Work

d)

Joule

33.

________________ is the rate at which work is done.

a)

Power

b)

Work

c)

Time

d)

Energy

34.

The unit of power (aka Joule per second)

a)

Joule

b)

Minute

c)

Watt

d)

Pound

35.

Energy cannot be ________ or ___________.

a)

big/small

b)

left/right

c)

created/destroyed

d)

made/transferred

36.

In which case is work being done?

a)

A

b)

B

c)

C

d)

D

37.

Joel and Jerry push against a car that has stalled, trying unsuccessfully to get it moving. Jerry stops after 10 min, while Joel is able to push for 5.0 min longer. Compare the work they do on the car.

a)

Joel does 75% more work than Jerry.

b)

Joel does 50% more work than Jerry.

c)

Jerry does 50% more work than Joel.

d)

Joel does 25% more work than Jerry.

e)

Neither of them does any work.

38.

ln the Empire State Building Run-Up, competitors race up the 1576 steps (86 flights) of the Empire State Building, climbing a total vertical distance of 320 m. How much work does a m 74 kg racer do?

a)

2.321 × 105 Joules

b)

2.326 × 105 Joules

c)

2.318 × 105 Joules

d)

2.317 × 105 Joules

39.

This weight lifter raised 105 kg to a height of approximately 2.31 m in 9 seconds. How much power did he developed?

a)

264 Watts

b)

1029 Watts

c)

2,377 Watts

d)

4,009 Watts

40.

A motor produces 500.0 W of power in 15 s. How

much work is done?

a)

7,500 J

b)

33 J

c)

765 J

d)

8,000 J

41.
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
42.
800 Newtons of force moving a distance of 20 meters will be how much work done?
a)
40 J
b)
1,600 J
c)
400 J
d)
16,000 J
43.
How far does a car that weighs 5,000 N go if 18,000 J of work is done on it?
a)
3.8 m
b)
3.7 m
c)
3.2 m
d)
3.6 m
44.
A Mustang has more horsepower than your mom's minivan. What does this mean?
a)
The Mustang has a higher topspeed.
b)
The minivan has a worse gas mileage.
c)
The Mustang can do work faster.
d)
The Mustang will die.
45.
Any device that makes work easier is called a ______________________.
a)
Joule 
b)
prop
c)
lever
d)
machine
46.
The efficiency of a machine can be increased by reducing __________________________. 
a)
effort
b)
resistance friction
c)
fulcrum
d)
friction
47.
No machine in existence has 100% efficiency due to ____________________.
a)
magic
b)
friction
c)
smoke
d)
input
48.
A 5000N block is lifted 10 m. How much work was done?
a)
50000 J
b)
5000 J
c)
500 J
d)
50 J
49.
A 16 N force is applied to an object and 96 J of work is done. How far was the object moved?
a)
6 m
b)
16 m 
c)
80 m 
d)
1536 m 
50.
A lever and fulcrum are used to lift a fallen tree, which has a weight of 480 N. If the lever has a mechanical advantage of 5.5, what is the input force that will begin lifting the tree off the ground?
a)
5.5 N
b)
40.7 N
c)
87.3 N
d)
2640 N

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