# 7th Grade- Unit 4 Question Preview (ID: 33713)

### Physical Science Part 1.[print questions] Answers? Play games to get them!

An inclined plane is?
a) a triangular object that lifts and separates heavy objects
b) a slanting surface connecting a lower lever to a higher level
c) a stiff bar or beam that rests on a support called a hinge or fulcrum
d) simple machine that uses grooved wheels on an axle and a rope

A mechanical system is?
a) the power to accomplish a task that involves forces and movement
b) the shortest distance from the initial to the final position of a point
c) any influence that causes an object to undergo a change
d) the measure of the effectiveness with which a system performs

Mechanical advantage is?
a) the ability to act or produce an effect
b) the assembly of bodies connected together to manage forces and movement
c) the basic mechanical parts used as the building blocks of most machines
d) the calculation/measure of how much faster/easier a machine makes your work

A biface is?
a) a two-sided inclined plane
b) a two-sided screw
c) a two-sided stone tool
d) a two-sided wedge

The second class of simple machines includes
a) lever, pulley, wheel and axle
b) inclined plane, screw, wedge
c) wheel and axle, screw, lever
d) pulley, inclined plane, wedge

The first class of simple machines includes
a) pulley, screw, lever
b) lever, inclined plane, wedge
c) wheel and axle, wedge, screw
d) lever, pulley, wheel and axle

It is common to call the output the
a) load or resistance
b) friction or power
c) effort or virtual work
d) force or leverage

All six of the simple machines have been used for thousands of years and were identified by
a) Italian astronomers drawings
b) Isaac Newtonâ€™s early documents discovered recently
c) Renaissance scientistsâ€™ drawings from Greek texts on technology
d) Ancient drawings unearthed in ancient Egypt

Simple machines make work easier for us by
a) doing all the work for us
b) allowing us to push or pull over increased distances
c) by using computers for the work
d) by using output force to increase input source

It is common to call the input the
a) virtual work
b) power
c) load
d) effort

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