Work and Simple Machines

What is the definition of work?

• A job that completes a task

• Energy transferred when a force makes an object move

• Earning money

• Using a computer

If you push against an object and it doesn't move, are you doing work?

• No

• Yes

A ___________ is a device that changes the force or increases the motion from work.

• Work

• Job

• Machine

• Calculator

In order for work to be done, what two things need to happen?

• Object needs to move in any direction

• Object needs to have acceleration and speed

• Object must move and must move in the direction of the force applied

• Object needs to feel force, it doesn't matter if it moves

What is needed to calculate work?

• time and distance

• speed and distance

• force and direction

• acceleration and velocity

Is this an example of work?

• Yes

• No

What is the unit of measurement for work?

• meters

• newtons

• m/s

• Joules

Newtons are the unit for _____________.

• Work

• Distance

• Acceleration

• Force

What is mechanical advantage?

• The advantage a machine has over a bicycle

• A measure of how much a simple machine reduces work

• A measure of when is the best time to use a simple machine

• A measure of the input force is multiplied using a simple machine

A ramp is an example of a(n)

• inclined plane
• fulcrum
• force
• lever