Work and Simple Machines

Physical

100

This is the SI unit of work.

Joule

200

This is another name for a Joule

newton-meter)

300

This is the SI unit of power

Watt

400

This is the SI unit of force

Newton

500

When you do this to an object, you transfer both kinetic and potential energy to it.

lifting it

Science

100

Rolling, pushing, or lowering an object transfers this to the object.

Kinetic energy

200

Work performed on an object transfers this to the object.

Energy

300

I moved a chair 5 m with a force of 20 N in 2 s, doing this much work.

100J

400

I moved a chair 5m using 20n in 2s using this much power to move the chair.

50W

500

A Watt is equal to this

one Joule per Second

Is

100

This must happen in order for work to be done

A force must move an object

200

This increases the efficiency of a complex machine

reducing friction by lubricating.  

300

This is a machine's efficiency

The ratio of output work to input work

400

Because Friction always converts some of the input work into thermal energy, this happens

Output work is always less than input work

500

Use this info to calculate the IMA of an inclined plane

It's height and length

The

100

Define a simple machine

uses one movement to accomplish work

200

name the 6 simple machines

screw, inclined plane, lever, wheel and axel, pulley, wedge

300

These two factors affect the amount of work done on an object

force and distance

400

A force does no work when this condition occurs. 

It doesn't act in the direction of motion

500

This is a characteristic of a wedge.

Sloped, moveable inclined plane...

Best

100

A broom is an example of this type of lever.

Third class.

200

A hammer is an example of this kind of lever.

First class.

300

A nutcracker is an example of this kind of lever

Third class

400

MA=

output force/input force

500

A simple machine cannot do this

decrease the amount of work done.