Work and 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

Tags

NGSS.MS-PS3-5

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

• No

• Yes

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

When the force is perpendicular to the motion, the work being done is 0.

• True

• False

If force and motion are parallel, the work done is...?

• force times the distance

• force

• distance and speed

• force in N

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

• Work

• Job

• Machine

• Calculator

A _________ does work with just one movement of the machine.

• Compound Machine

• Simple Machine

• Useful Machine

• Efficient Machine

A __________ is a combination of two or more simple machines

• Simple Machine

• Compound Machine

• Efficient Machine

• Useful Machine

Which is an example of a simple machine.

• Doorknob

• Pulley

• Bicycle

• Knife

Which is an example of a compound machine.

• Knife

• Gears

• Doorknob

• Levers