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WorksheetsChapter 5 8th Grade physical Science Work and Machines Putman
Total questions: 14
Worksheet time: 7mins
Name
Class
Date
1.
A slanted surface used to raise an object is a(n) ____.
a)
screw
b)
effort ramp
c)
inclined plane
d)
efficiency board
2.
A device that does work with only one movement and changes the size or direction of a force is a(n) ____.
a)
effort machine
b)
screw
c)
compound machine
d)
simple machine
3.
A bar that is free to pivot about a fixed point is a ____.
a)
screw
b)
lever
c)
ramp
d)
fulcrum
4.
The rate at which work is done is called ____.
a)
effort time
b)
efficiency
c)
force
d)
power
5.
The amount by which a machine multiplies an effort force is called the ____.
a)
efficiency factor
b)
fulcrum
c)
mechanical advantage
d)
resistance force
6.
An inclined plane with one or two sloping sides forms a machine called a ____.
a)
pulley
b)
ramp
c)
lever
d)
wedge
7.
An inclined plane wrapped around a cylindrical post is a ____.
a)
screw
b)
ramp
c)
lever
d)
block and tackle
8.
A winding mountain road is an example of a(n) ____.
a)
wheel and axle
b)
inclined plane
c)
block and tackle
d)
lever
9.
When two or more simple machines work together, they are called a(n)____.
a)
compound machine
b)
screw
c)
simple machine
d)
effort machine
10.
The unit of power is the ____.
a)
m/s
b)
watt
c)
second
d)
joule
11.
A lever with a mechanical advantage greater than 1 is used to ____.
a)
increase force and change direction
b)
increase distance
c)
increase force
d)
change direction
12.
Three of the following simple machines are basically the same. The one that does NOT belong with the group is the ____.
a)
wheel and axle
b)
pulley
c)
wedge
d)
lever
13.
An arrangement of pulleys designed to reduce the effort force is called a ____.
a)
block and tackle
b)
fixed pulley
c)
movable pulley
d)
simple pulley
14.
Two simple machines that are part of a bicycle are a(n)____.
a)
gear and a wheel and axle
b)
inclined plane and a wedge
c)
screw and an inclined plane
d)
inclined plane and a lever
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