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simple machines

Total questions: 30

Worksheet time: 3600secs

Name
Class
Date
1.
Which is not a type of simple machines?
a)
spring
b)
screw
c)
pulley
d)
wedge
2.
What type of simple machine is found on the cap of a pickle jar?
a)
lever
b)
inclined plane
c)
screw
d)
wheel and axle
3.
A knife is an example of a (an)
a)
inclined plane
b)
wedge
c)
ramp
d)
pulley
4.
All of these are examples of a wheel and axle except:
a)
pizza cutter
b)
doorknob
c)
windmill
d)
lever
5.
To increase the mechanical advantage of a lever
a)
make sure the fulcrum is in the middle of the lever
b)
move the fulcrum closer to the load
c)
move the fulcrum closer to the effort
d)
use a bigger fulcrum
6.
A push or pull is a 
a)
load
b)
fulcrum
c)
force
d)
work
7.
________________ is done whenever a force moves an object a distance
a)
load
b)
friction
c)
force
d)
work
8.
A ramp is an example of a(n)
a)
inclined plane
b)
fulcrum
c)
force
d)
lever
9.

An example of a lever is

a)

doorstop

b)

drill

c)

staircase

d)

hammer

10.
A doorknob is an example of a
a)
wheel and axle
b)
inclined plane
c)
pulley
d)
wedge
11.
Which of the following is true for the picture?
a)
elephant is the fulcrum, mouse is the effort, triangle is the load
b)
mouse is the fulcrum, triangle is the effort, elephant is the load
c)
triangle is the fulcrum, mouse is the effort, elephant is the load
12.
A machine multiplies your effort force by 3 times.  What does the number 3 represent?
a)
force
b)
mechanical advantage
c)
distance
d)
work
13.
What kind of lever has the fulcrum between the effort and the resistance and changes the direction of a force?
a)
1st Class Lever
b)
2nd Class Lever
c)
3rd Class Lever
d)
No Class Lever
14.
What is the formula for calculating work?
a)
F = w/d
b)
w= f x  d
c)
d = w/f
d)
ma = Fr/Fe
15.
What is the fixed point around which a lever is free to turn?
a)
fulcrum
b)
resistance
c)
effort
d)
lever
16.
What is the mechanical advantage of a simple machine if a force of 15 newtons lifts an object weighing 60 newtons?
a)
2
b)
45
c)
.25
d)
4
17.
How much work is done in moving a box 20 meters, using a force of 25 newtons?
a)
500 meters
b)
500 joules
c)
45 joules
d)
5 meters
18.
Thomas is using a screwdriver to pry open a paint can,  The screwdriver is being used as
a)
a pulley
b)
an inclined plane
c)
a screw
d)
a lever
19.
Identify this simple machine
a)
Lever
b)
Wheel & Axle
c)
Inclined Plane
d)
Screw
20.

What simple machine is in this image

a)

Wedge

b)

Lever

c)

screw

d)

wheel and axel

e)

Incline plane

21.
David wants to lift Moses using a moveable pulley.  If Moses weighs 150 lbs, and David uses a force of 30 lbs, how much is the mechanical advantage?
a)
10
b)
450
c)
5
d)
8
22.

Simple machines___________ distance in order to______________ the amount of forcde needed to do work.

a)

increase; decrease

b)

increase; increase

c)

decrease; increase

d)

decrease; decrease

23.
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
24.

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

25.
The amount by which a machine multiplies input force is known as the 
a)
work.
b)
power.
c)
output force.
d)
mechanical advantage.
26.
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)
1000
d)
100
27.

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

a)

2.4

b)

3.4

c)

4.4

28.
Force is a _____ or _______
a)
simple    complex
b)
push     pull
c)
up      down
d)
in      out
29.

Actual mechanical advantage is never more than ideal mechanical advantage primarily due to

a)

distance

b)

force

c)

friction

d)

efficiency

30.

Reducing friction will ________________ the efficiency of a machine

a)

increase

b)

decrease

c)

have no effect

d)

none of these...it depends on the situation

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