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Simple Machines, Work, and Mechanical Advantage

Total questions: 50

Worksheet time: 54mins

Name
Class
Date
1.

units of force are

a)

newtons

b)

grams

c)

joules

d)

meters

2.

units for work are

a)

newtons

b)

joules

c)

meters

d)

seconds

3.

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

4.
work transfers
a)
sweat
b)
energy
c)
velocity
d)
effort
5.
Which situation is work not done?
a)
lifting a 20 pound box off the floor
b)
holding a 20 pound box above the floor
c)
sliding a 20 pound box across the floor
d)
sliding a 20 pound box up an inclined plane
6.
Which is doing work?
a)
pushing a wall
b)
holding a box
c)
picking up a pencil
d)
sitting in a chair
7.

A machine with a 5N input force and a 25N output force has a mechanical advantage of?

a)

2

b)

5

c)

20

d)

125

8.

A machine is less than 100% efficinent because of

a)

Thermal energy

b)

Nuclear energy

c)

Electrical energy

d)

Friction

9.

The doorknob is an example of a simple machine known as a __________________, that makes work easier by using ___________________ to multiply a force.

a)

wedge, direction

b)

wheel and axle, distance

c)

wheel and axle, direction

d)

pulley, distance

10.
The efficiency of a machine can be increased by reducing __________________________. 
a)

effort force

b)

resistance force

c)
fulcrum
d)
friction
11.
The flag pole mechanism is an example of which simple machine? 
a)
Inclined Plane
b)
Lever
c)
Wedge
d)
Pulley
12.
Simple machines make the work we have to do easier, but it is still the same amount of work.
a)
TRUE
b)
FALSE
13.
A ramp.
a)
Lever
b)
Inclined Plane
c)
Wedge
d)
Screw
14.

What type of simple machine is pictured?

a)

Wedge

b)

Wheel and Axle

c)

Inclined Plane

d)

Lever

15.

What type of simple machine is pictured?

a)

Pulley

b)

Lever

c)

Wheel and Axle

d)

Inclined Plane

16.
In third class levers, the ______ is in the middle. 
a)
Effort
b)
Fulcrum
c)
Load
17.
A wheelbarrow is an example of
a)
First Class Lever
b)
Second Class Lever
c)
Third Class Lever
d)
Fourth Class Lever
18.
This is an example of what simple machine?
a)
wheel and axle
b)
wedge
c)
pulley
d)
screw
19.
The blade of a shovel acts as one type of machine as it separates soil when it enters the ground.  The handle of the shovel acts as a second type of machine when the person using it lifts the soil.  What 2 simple machines make up a shovel?
a)
pulley and wedge
b)
screw and inclined plane
c)
lever and pulley
d)
wedge and lever
20.
The fixed point that a lever rotates around is called the
a)
wedge
b)
inclined plane
c)
lever
d)
fulcrum
21.
If you use a crowbar to get the lid off of a bucket, what simple machine are you using?
a)
Inclined Plane
b)
Pulley
c)
Wheel and Axle
d)
Lever
22.
Which type of lever is this?
a)
First Class Lever
b)
Second Class Lever
c)
Third Class Lever
d)
Coach  Class Lever
23.
A simple machine that is made up of an inclined plane wrapped around a cylinder. It is often used to hold things together.
a)
lever
b)
screw
c)
wedge
d)
velcro
24.
What kind of lever is this?
a)
First Class Lever
b)
Second Class Lever
c)
Third Class Lever
25.
Which pulley makes work easiest?
a)
1
b)
2
c)
3
d)
they are all the same
26.
Students pulled the same mass up an inclined plane that was 20 cm, 30 cm, and 40 cm long. Each time, they used a spring scale to measure the force needed to pull the mass up the inclined plane. What did they conclude?
a)
Less force was needed on the 20 cm plane
b)
More force was needed on the 40 cm inclined plane.
c)
The least amount of force was needed on the 40 cm inclined plane.
d)
The least amount of force was needed on the 30 cm inclined plane.
27.
What is the mechanical advantage of this pulley system?
a)
2
b)
3
c)
4
d)
5
28.

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

a)

2.4

b)

3.4

c)

4.4

29.

*A box of weight W is lifted by a force F using a lever as shown below.

What is the mechanical advantage of the lever (IMA=de / dr) IMA = Input Distance/Output Distance)?

a)

0.5

b)

2

c)

3

d)

6

30.

Which of these describes the Force-Distance Trade-Off?

a)

A simple machine decreases the force necessary to do work by increasing the distance

b)

A simple machine decreases the work done by increasing the distance

c)

A simple machine decreases the work done by increasing the force

d)

A simple machine decreases the force necessary to do work by decreasing the distance

31.
The force placed on the simple machine to move the load is called the ____.
a)
Effort
b)
Fulcrum
c)
Load
d)
Lever
32.

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

c)

the force the machine exerts on a object

d)

the output work times the input distance

33.
A simple machine is a device that helps to reduce the amount of _____ required to work.
a)
force
b)
energy
c)
work
34.

Simple machines make work easier by INCREASING _____ .

a)

the distance over which work is done 

b)

the force needed to do work 

c)

the time required to do work

35.

How can simple machines make work easier?

a)

by decreasing the force needed to complete the task

b)

by increasing the friction between the machine and the object

c)

by adding more work on the object than originally applied

d)

by removing the force of gravity on the object

36.

how does a machine change the amount of work done?

a)

it depends on the machine

b)

a machine doesn't change the amount of work done

c)

it doubles the amount of work done

d)

it makes less work being done

37.

True or False: Simple machines decrease the amount of work done ​ (a)  

Choose from the below words
False
True
38.

A machine makes work easier by:

a)

changing the direction of the applied force

b)

changing the size of the applied force

c)

changing the distance over which the force is applied

d)

increasing the work being done

39.

Work = Force x Distance. If a machine multiplies the effort force, YOU have to put more ____ in.

a)

Effort Force

b)

Effort Distance

c)

Resistance Force

d)

Resistance Distance

40.

In a simple machine with a Mechanical Advantage > 1, which will be greater:

 Effort Force or Resistance Force?

a)

Resistance Force

b)

Effort Force

c)

They will be equal

d)

Input Force

41.

=

a)

The weight of object being lifted

1.

Resistance force

b)

How hard you push a machine

2.

Effort Force

c)

The distance the object is moved without the machine.

3.

Resistance distance

d)

The distance YOU move the object on the machine

4.

Effort distance

e)

How many times the machine multiplies your force

5.

Mechanical Advantage

42.

Match the following

a)

Distance from fulcrum to Effort force

1.

Effort Distance

b)

Distance from fulcrum to Resistance force

2.

Resistance Distance

c)

Weight of object

3.

Resistance Force

d)

How hard you pull

4.

Effort Force

e)

Effort Distance/ Resistance Distance

5.

Mechanical Advantage

43.

You exert 50 N of force to push a box 3 m up a ramp. How much work did the MACHINE do for you? (Don't forget your unit!)

(a)  

44.

You use a crowbar to open a jammed locker. 10 cm of the crowbar is wedged into the locker. You put your hand 40 cm away from where the crowbar touches the locker. You pry it open. What is the mechanical advantage?

a)

10

b)

40

c)

1

d)

4

45.

You use a crowbar to open a jammed locker. 10 cm of the crowbar is wedged into the locker. You put your hand 40 cm away from where the crowbar touches the locker. You pry the locker open. If you put 25 lbs of force on the crowbar, how many pounds of force did the lever push on the locker?

a)

100 lbs

b)

25 lbs

c)

10 lbs

d)

1000 lbs

46.

The resistance force is the (a)   of the object being lifted.

47.

A ramp is 10 m long and 2 m high. The effort distance is _ (use correct units).

(a)  

48.

A ramp is 10 m long and 2 m high. The resistance distance is _ (use correct units).

(a)  

49.

A ramp is 10 m long and 2 m high. The mechanical advantage is _ .

(a)  

50.

You ride your bike up a steep hill, and shift the gears so that it is easier. What is the Force and Distance tradeoff?

a)

You push with less force but move your legs more distance.

b)

You push with less force but and less distance.

c)

You push with more force and move your legs more distance.

d)

You push with less force but move your legs less distance.

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