Grade 8

Machines help us to make work:

• easier

• difficult

• complex

Simple machines have

• Few moving parts

• No moving parts

• Many moving parts

The purpose of a simple machine is to:

• Test force

• Make work easier

• Use more force

A machine that is a combination of two or more compound machines is:

• Simple machine

• Compound machine

• Complex machine

A crane is an example of a:

• It's not a machine

• Simple machine

• Mechanical system

An example of a compound machine is

• Wheelbarrow

• Aeroplane

• Car

An example of complex machine is

• Aeroplane

• Bicycle

• Car

Calculate the mechanical advantage in using the lever to move the car if the car weighs 9000N, the effort force is 300N.

• 3

• 30

• 300

the ability to do work

• Work

• Energy

• Force

a push or a pull.

• Work

• Energy

• Force