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WorksheetsCh 12 Work & Machines Test
Total questions: 26
Worksheet time: 13mins
Name
Class
Date
1.
What is the formula for work?
a)
force * distance
b)
force / distance
c)
force - distance
d)
force + distance
2.
What is the unit of work?
a)
Watt (W)
b)
Newton (N)
c)
Joule (J)
d)
meter (m)
3.
What is power?
a)
the amount of work done per unit of time
b)
the amount of force on a certain area
c)
the amount of pressure in a volume of liquid
d)
the amount of mass in a given volume
4.
What is the unit for power?
a)
Joule (J)
b)
meter per second (m/s)
c)
Watt (W)
d)
meter (m)
5.
The force you apply to a machine is the
a)
input force
b)
output force
c)
mechanical advantage
d)
efficiency
6.
What is the efficiency of an ideal machine?
a)
greater than 100%
b)
less than 100%
c)
equal to 100%
d)
0
7.
What is the efficiency of a real machine?
a)
greater than 100%
b)
less than 100%
c)
equal to 100%
d)
0
8.
What is the fixed point that a lever rotates around called?
a)
output force
b)
input force
c)
fulcrum
d)
wedge
9.
What type of simple machine is a screwdriver?
a)
pulley
b)
lever
c)
wheel and axle
d)
wedge
10.
What type of simple machine are your front teeth?
a)
wedges
b)
levers
c)
pulleys
d)
compound machines
11.
In order to do work on an object, the object must _______ as a result of your force.
a)
pulley
b)
efficiency
c)
inclined plane
d)
move
12.
A machine's _______ compares the input work to the output work.
a)
efficiency
b)
inclined plane
c)
move
d)
wedge
13.
An inclined plane wrapped around a circle is a
a)
pulley
b)
screw
c)
wedge
d)
efficiency
14.
A rope wrapped around a grooved wheel is a
a)
inclined plane
b)
pulley
c)
screw
d)
wedge
15.
A ramp is an example of an
a)
inclined plane
b)
pulley
c)
screw
d)
wedge
16.
A pulley can change the direction of the input force
a)
true
b)
false
17.
What kind of simple machine is the ramp in the picture?
a)
pulley
b)
lever
c)
inclined plane
d)
wedge
18.
Jill pushed the table with a force of 40 newtons. If the table does NOT move,
a)
no force was acting on the table
b)
no work was done on the table
c)
no air pressure is on the table
d)
gravity did not act on the table
19.
Work = Force * Distance. If Eric moved the stool 3 meters, how much work did he perform?
a)
20 Joules
b)
23 Joules
c)
17 Joules
d)
60 Joules
20.
How does a ramp make work easier?
a)
it increases force
b)
it decreases work
c)
it changes the distance of the force
d)
it changes the direction of the force
21.
When a mover pushes the box up the ramp, there is friction between the box and the ramp. What is the efficiency of the ramp?
a)
greater than 100%
b)
less than 100%
c)
equal to 100%
d)
0
22.
What type of friction acts on objects that aren't moving?
a)
static friction
b)
sliding friction
c)
rolling friction
d)
fluid friction
23.
What type of friction occurs when 2 solid surfaces slide over each other?
a)
static friction
b)
sliding friction
c)
rolling friction
d)
fluid friction
24.
What type of friction occurs when an object rolls across a surface?
a)
static friction
b)
sliding friction
c)
rolling friction
d)
fluid friction
25.
What type of friction occurs when a solid object moves through a fluid?
a)
static friction
b)
sliding friction
c)
rolling friction
d)
fluid friction
26.
What type of force pulls objects toward each other?
a)
gravity
b)
pressure
c)
centripedal force
d)
friction
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