Show:
Energy
Work
Power
Machines
Simple Machines
100

What is energy?

The ability to do work or cause change

100

What is work? 

A transfer of energy when an applied force moves an object over a distance. 

100

What is power?

The rate at which work is done. 

100

What is a machine?

A device that makes doing work easier

100

This simple machine is an inclined plane wrapped around a post. What is it?

A screw. 

200
What unit is used to measure energy
Joules (J)
200
What unit is used to measure work?
Joules (J)
200
What units are used to measure power?
Watts (W)
200
A machine that exists as many simple machines together is known as what?

A compound/complex machine. 

200

This simple machine is used to spilt objects or hold them into place. What is it?

A wedge. 

300

Name the five types of kinetic energy. 

Thermal, Mechanical, Radiant, Sound, Electircal

300

What two factors are needed to find out how much work is done?

Force and Distance

300

What two factors are needed to find power?

Work and time

300

What is mechanical advantage?

The number of times a machine increases a force exerted on it.

300

This simple machine makes it easier to raise or lower heavy objects by changing the distance of applied force. What is it? 

An inclined plane. 

400

What are the four Protentional Energies?

GPE, Chemical, Nuclear, Elastic

400
Bob pushes a lawn mower with a force of 300 N in the direction that it moves. It moves 500 m. How much work does he do?
150,000 J
400
Hank does 500 J of work in 2 s. How much power does he use?
250 Watts
400

What MAIN two things are needed to find mechanical advantage?

Input force and output force 

400

Name all 6 simple machines. 

Inclined plane, wedge, screw, lever, wheel and axle, and pulley

500

When I go running, what energy transformation takes place? - Explain

Chemical energy is transformed to kinetic energy (Mechanical/Heat)

500
Billy does 400 J of work when he exerts a force of 50 Newtons on a book in the direction it moves. How far does the book move?
8 meters
500
Kevin exerts a force of 200 N over 40 m in 20 seconds. How much power does he use?
400 Watts
500

How do we calculate efficiency? 

(Actual Mechanical Advantage/Ideal Mechanical Advantage)100 or (Work Output/ Work Input)100

500

What class of lever has a set up of: 

Fulcrum --> Effort --> Load

3rd class lever