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WorksheetsMr. Putman's 8th Grade Science Chapter 14
Total questions: 15
Worksheet time: 8mins
Name
Class
Date
1.
Which one of the following is NOT an example of work being done?
a)
the moon orbiting the Earth
b)
pushing a box from the bottom of a hill to the top of a hill
c)
pulling a sled across a field covered with snow
d)
lifting a bookbag off the floor
2.
A fixed, single pulley that is used to lift a block does which one of the following?
a)
doubles the force required to lift the block
b)
decreases the force required to lift the block
c)
makes the block easier to lift by changing the direction of the force needed to lift it
d)
decreases the force required and changes the direction of the force required
3.
A slanted surface used to raise an object is a(n)____.
a)
effeciency board
b)
effort ramp
c)
incline plane
d)
wedge
4.
A device that does work with only one movement and changes the size or direction of a force is a(n) ___________.
a)
compound machine
b)
effort machine
c)
screw
d)
simple machine
5.
A bar that is free to pivot about a fixed point is a ____.
a)
fulcrum
b)
lever
c)
ramp
d)
wedge
6.
The rate at which work is done is called ____.
a)
efficiency
b)
effort time
c)
force
d)
power
7.
The work output of a machine divided by the work input is the ____ of the machine.
a)
efficiency
b)
effort
c)
power
d)
resistance
8.
The amount by which a machine multiplies an input force is called the ________.
a)
efficiency factor
b)
fulcrum
c)
mechanical advantage
d)
resistance force
9.
An inclined plane with one or two sloping sides forms a machine called a ____.
a)
pulley
b)
lever
c)
ramp
d)
wedge
10.
An inclined plane wrapped around a cylinder post is a ____.
a)
lever
b)
ramp
c)
screw
d)
wedge
11.
A machine that changes only the direction of a force has a mechanical advantage of _______.
a)
1
b)
2
c)
10
d)
100
12.
A winding mountain road is an example of a(n) _______.
a)
level
b)
incline plane
c)
wedge
d)
wheel and axle
13.
When two or more simple machines work together, they are called a(n) __________.
a)
compound machine
b)
effort machine
c)
screw
d)
simple machine
14.
A lever with a mechanical advantage greater than 1 is used to ________.
a)
change direction
b)
increase distance
c)
increase force
d)
decrease force
15.
Three of the following simple machines are basically the same. The one that does NOT belong with the group is the ________.
a)
lever
b)
pulley
c)
wedge
d)
wheel and axle
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