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Test: Chapter 9: Mechanical Advantage Simple Machines (5/17)

Total questions: 40

Worksheet time: 1hrs 28mins

Name
Class
Date
1.

Gravitational potential energy is defined as:

a)

the energy an object has due to its height above the ground.

b)

the energy an object has due to its motion.

c)

the energy a spring has due to its stretch.

d)

the chemical energy stored in the molecules of atoms.

2.

The equation for gravitational potential energy is :

a)

PEg = mgh

b)

PEg= 1/2kx2

c)

PEg= Fd

d)

PEg = 1/2mv2

3.

Kinetic Energy is defined as:

a)

Energy stored due to its location

b)

Energy of motion

c)

Energy stored in the bonds of molecules

d)

Heat energy

4.

The equation to find kinetic energy is:

a)

KE=1/2mv2

b)

KE=mgh

c)

KE=1/2kx2

d)

KE=Fd

5.

A 70 kg runner has a velocity of 5 m/s. Her kinetic energy is:

a)

875 J

b)

175 J

c)

1750 J

d)

350 J

6.
Which of the following objects has the most kinetic energy?
a)
A 20 kg toddler running at 5 m/s
b)
A 50 kg toddler running at  30 m/s
c)
A 90 kg toddler running at 30 m/s
d)
A 100 kg  toddler running at 2 m/s
7.

A 5 kg ball is lifted 12 m above the ground. It's gravitational potential energy is:

a)

60 J

b)

600 J

c)

17 J

d)

2.4 J

8.
You drop a 5 kg ball from a height of 2 m. Just before it reaches the ground, what type of energy does it have?
a)
Potential Energy
b)
Kinetic Energy
c)
Nuclear Energy
d)
Chemical Energy
9.
You drop a 5 kg ball from a height of 2 m. Just before it reaches the ground, how much kinetic energy does it have?
a)
10 J
b)
100 J
c)
7 J
d)
20 J
10.
You drop a 5 kg ball from a height of 2 m. Just before it reaches the ground, what is the ball's velocity?
a)
6.32 m/s
b)
40 m/s
c)
4.47 m/s
d)
100 m/s
11.

An object is speeding up when: (Choose All That Apply) (May have to choose more than 1 to be right)

a)

it is gaining kinetic energy.

b)

it is losing kinetic energy.

c)

it is gaining gravitational potential energy.

d)

it is losing gravitational potential energy.

12.

At which point in the picture must the cart have been moving the fastest?

a)

Point 1

b)

Point 2

c)

Point 3

d)

They would all be the same

13.

Friction is a force that causes a moving object to slow down or stop.

a)

True

b)

False

14.

What is work measured in?

(a)  

15.

The amount the resistance end of a lever moves is called the _________.

a)

Output Distance

b)

Output Work

c)

Output Force

16.

The factor by which a simple machine makes doing work feel easier.

a)

Input Force

b)

Efficiency

c)

Mechanical Advantage

17.

The rate at which work is done

a)

Output Work

b)

Power

c)

Joules

18.

Is walking up a flight of stairs doing "work?"

a)

Yes

b)

No

c)

Austin and Connor

19.

What type of simple machine is this?

a)

1st class lever

b)

2nd class lever

c)

Block-and-Tackle

20.

Causes machines to not be 100% efficient

a)

Human error

b)

Heat loss

c)

Friction

21.

A force applied for a distance is...

a)

Power

b)

Energy

c)

Work

22.

What type of simple machine is this?

a)

2nd class lever

b)

3rd class lever

c)

Peter Damon

23.

How do you find the Ideal Mechanical Advantage of a LEVER.

a)

Divide the Input Length by the Output Length

b)

Multiple the Input Length by the Efficiency

c)

Divide the Output Length by the Input Length

24.

How do you increase the efficiency of a machine?

a)

Increase the length of the machine.

b)

Oil the machine.

c)

Reduce the weight on the output side.

25.

What type of machine is this?

a)

1st Class Lever

b)

2nd Class Lever

c)

3rd Class Lever

26.

The unit for Power

a)

Watt

b)

Joule

c)

Newton

27.
Using 10 N of force to move a box 2 m,
= how much work?
a)
0 (zero) J
b)
20 J
c)
12 J
d)
8 J
28.
Device that makes work easier by changing the size or direction of the force  (or both) is called a
a)
simple machine
b)
spring scale
c)
newton
d)
pulley
29.
If Sarah uses a ramp to put a box in a truck, while Nick lifts a similar box directly into the truck, who used MORE force?
a)
Sarah
b)
Nick
30.
Which inclined plane would require the least amount of effort force?
a)
A
b)
B
c)
C
d)
D
31.

What unit is used to measure force?

a)

distance

b)

Newtons

c)

meters

d)

m/s

32.
What is the mechanical advantage if you lift a load of 300 newtons and you only push down with 50 newtons?
a)
250
b)
50
c)
60
d)
6
33.

Which machine efficiency is impossible?

a)

1%

b)

80%

c)

99%

d)

100%

34.
An important way to improve the efficiency of a machine is to __ the amount of friction.
a)
increase
b)
decrease
c)
maintain
35.

If I have a wedge with a MA of 5 and an output distance of 2, than what is the input distance?

a)

10

b)

100

c)

1000

d)

10000

36.

A crocodiles teeth would be most similar to what type of simple machine?

a)

lever

b)

wheel and axil

c)

wedge

d)

inclined plane

37.
Jeff is a landscaping contractor and lifts a rock weighing 600 pounds by wedging a board under the rock. Jeff weighs 150 pounds and puts all of his weight on the lever. How much mechanical advantage did the lever provide to Jeff in lifting the rock?
a)
0
b)
2
c)
4
d)
8
38.
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
39.
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
40.

A lever has an effort (input) arm length of 75 ft and an output (resistance) arm length of 25 ft. The mechanical advantage of this lever is:

a)

3

b)

.33

c)

1875

d)

not enough information to solve this

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