Chapter 11 Work and Machines

A slanted surface used to raise an object is a(n)

____.

• efficiency board

• effort ramp

• inclined plane

• screw

Tags

NGSS.MS-ETS1-1

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

• compound machine

• effort machine

• screw

• simple machine

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

____.

• fulcrum

• lever

• ramp

• screw

The rate at which work is done is called ____.

• efficiency

• effort time

• force

• power

The amount by which a machine multiplies an effort force is called the ____.

• efficiency factor

• fulcrum

• mechanical advantage

• resistance force

An inclined plane wrapped around a cylindrical

post is a ____.

• block and tackle

• lever

• ramp

• screw

A machine that changes only the direction of a force has a mechanical advantage of ____.

• 100

• 10

• 5

• 1

A winding mountain road is an example of a(n)

____.

• block and tackle

• lever

• inclined plane

• wheel and axle

When two or more simple machines work together, they are called a(n)____.

• compound machine

• effort machine

• screw

• simple machine

The unit of power is the ____.

• joule

• watt

• m/s

• second