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Power, Machines, and MA

Total questions: 45

Worksheet time: 45mins

Name
Class
Date
1.
What is the fixed point around which a lever is free to turn?
a)
fulcrum
b)
resistance
c)
effort
d)
lever
2.
What kind of simple machine is a wheelchair ramp?
a)
wheel and axle
b)
pulley
c)
wedge
d)
inclined planes
3.
Rope, chain, or belt wrapped around a wheel that changes the direction of an applied force. Movable or fixed types.
a)
wedge
b)
screw
c)
wheel and axle
d)
pulley
4.
Which type of simple machine is a see saw?
a)
Lever
b)
Wheel and axle
c)
Inclined plane
d)
Wedge
5.
A simple machine is a device that helps to reduce the amount of _____ required to work.
a)
force
b)
energy
c)
work
6.
An object being lifted or moved is a
a)

resistance or load

b)
fulcrum
c)
force
d)
work
7.

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

8.

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 (MA=Force Resistance/Force Effort)?

a)

1

b)

10

c)

100

d)

1000

9.

What is a machine?

a)

an object that has Artificial Intelligence.

b)

an object that is designed to take over the earth in 2050.

c)

a device that changes force by reducing it over a larger distance.

d)

a mechanism that is used to decrease the amount of work done.

10.

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 that is exerted by a machine to move an object

c)

the force the machine exerts on a object to make it disappear

d)

the output work times the input distance

11.

The mechanical advantage of this inclined plane is...(MA=Resistance Force/Effort Force)

a)

2.4

b)

3.4

c)

4.4

12.

Two factors that determine work are...

a)

Force

b)

Mass

c)

Velocity

d)

Distance

13.

Units of force are...

a)

Newtons

b)

Grams

c)

Joules

d)

Meters

14.

Units of work are...

a)

Newtons

b)

Grams

c)

Joules

d)

Meters

15.

If you push a cart with a force of 60 N for 2 m... how much work have you done?

a)

120 J

b)

30 J

c)

120 N

d)

30 N

16.

If 40N of force is applied to a 10 kg cart over a distance of 50 meters, how much work is done?

a)

8000 J

b)

8000 N

c)

4000 J

d)

2000 J

17.
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

18.

If an inclined plane has a MA of 5. How much input force would you need to put in to lift a 100 N car?

a)

20 N

b)

100 N

c)

1/20 N

d)

5 N

19.

Using a pulley you only need to apply a force of 2 N to lift a 20 N object. What is the MA of the pulley?

a)

2

b)

20

c)

10

d)

1/10

20.

When force is used to move an object across a distance, this is called...

a)

effort

b)

power

c)

energy

d)

work

21.

How much work is done if I use 5N of force to move an object 2 meters?

a)

10 Newtons

b)

7 Newtons

c)

10 Joules

d)

7 Joules

22.
Name this simple machine. 
a)
Inclined Plane
b)
Lever
c)
Pulley
d)
Wedge
23.
A machine multiplies your effort force by 3 times.  What does the number 3 represent?
a)
force
b)
mechanical advantage
c)
distance
d)
work
24.
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
25.

Which of the following is the best example of work being done.

a)

doing homework

b)

lifting a box

c)

pushing a stationary box

d)

holding a box

26.
In which of these cases is work being done? 
a)
A student sleeps
b)
A student pushes a locked door that does not move
c)
a student carries his chair into another room
d)
A student sits on the carpet
27.
True or false: when the distance an object moves is zero the work done on the object is also zero.  
a)
True
b)
False
28.
Work is done when a weightlifter holds a barbell still above his head.
a)
True
b)
False
29.

What would 54N be an example of?

a)

work

b)

power

c)

distance

d)

force

30.

what would 14J be an example of?

a)

work

b)

distance

c)

time

d)

force

31.

What is an example of a force?

a)

Energy

b)

Power

c)

Pressure

d)

Weight

32.
The amount of work done in a certain amount of time is known as 
a)
work
b)
effort force
c)
resistance force 
d)
power
33.

What would you solve for if given time and work?

a)

power

b)

force

c)

distance

d)

work

34.
P=25 watts 
W=5000 Joules 
t=???
a)
200 sec
b)
0.0005 s
c)
125000 s
d)
125 s
35.
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
36.
Work divided by time equals...
a)
energy
b)
power
37.
The unit of power is the...
a)
work
b)
watt
38.
Work is done on an object when the object moves in the SAME direction in which the force is applied.
a)
True
b)
False
39.
You do 90 joules of work in 30 seconds. How much power have you generated?
a)

30 watts

b)

3 watts

c)

120 watts

d)

270 watts

40.
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

41.
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

42.

A 100 N force is applied to move an object a horizontal distance of 5 meters at constant speed in 10 seconds. How much power is done?

a)

50J

b)

50W

c)

500J

d)

500W

43.

If you half the effort distance, you __ the mechanical advantage, and __ the effort force.

a)

double, half

b)

half, double

c)

double, double

d)

half, half

44.

If you double the effort distance, you __ the mechanical advantage, and __ the effort force.

a)

double, half

b)

half, double

c)

double, double

d)

half, half

45.

The purpose of the simple machine is to

a)

decrease the effort force

b)

increase the resistance force

c)

increase the resistance distance

d)

decrease the resistance distance

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