1) Simple machines make work easier for people by changing the amount of force needed to move an object.
The unit for force is Newtons, and it can be measured with a tool
called a spring scale.
What can be inferred from these quotes from the text?
A)
A pulley increases the number of Newtons needed to
lift an object.
B)
Inclined planes and spring scales can only be used
with spring scales.
)
Spring scales can also be used to find the volumes of
inclined planes and pulleys.
D)
The number of Newtons needed to lift an object is
less with a pulley than without it.