Unit 9 Test Review

A device that does work with only one movement and changes the size or direction of a force is the definition for a(n) ______.

• compound machine

• simple machine

• input machine

• ideal machine

A bar that is free to pivot about a fixed point is a ______.

• lever

• wedge

• fulcrum

• ramp

The rate at which work is done is the ______.

• efficiency

• imput time

• power

• force

The output work of a machine compared to its input force is the _____ of the machine.

• efficiency

• power

• input

• output

The amount by which a machine multiplies an input force is called the _______.

• output force

• efficiency

• fulcrum

• mechanical advantage

Two incline planes that meet to from a simple machine called a(n)_____.

• screw

• input arm

• lever

• wedge

An inclined plane wrapped around a cylindrical post is a

• wedge

• screw

• pulley

• lever

What are two or more simple machines that work together called?

• compound machine

• pulley

• lever

• wheel and axle

Three of the following simple machines are basically the same. Choose the one that DOES NOT belong with the group.

• pulley

• wedge

• lever

• wheel and axle

Which of the following CANNOT be done by a simple machine?

• change in direction of a force

• increase the amount of work done

• decrease the time it takes to do the work

• transfer energy from one location to another