Show:
Energy
Work
Power
Machines
Simple Machines
100
What is energy?
The ability to cause change
100

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

Force and Distance

100
What units are used to measure power?
Watts (W)
100
What is the force that a machine applies is called?
Output force
100
Name all 6 simple machines
Inclined plane, wedge, screw, lever, wheel and axle, and pulley
200
What unit is used to measure energy
Joules (J)
200
What unit is used to measure work?
Joules (J)
200

What two factors are needed to find power?

Work and time

200
What is a machine?
A device that makes doing work easier
200

What is mechanical advantage? 

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

300

Name the five types of kinetic energy. 

Thermal, Mechanical, Radiant, Sound, Electircal

300
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
300
What is power?
How quickly work is done
300
What two things are needed to find mechanical advantage?
Input force and output force
300

If the mechanical advantage of a machine is .33, what is the efficiency of that machine? 

33%

400
When a moving ball hits aother ball and makes it start to move, what has happened?
Energy transfer
400
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
400
Hank does 500 J of work in 2 s. How much power does he use?
250 Watts
400

What is needed to find efficiency?

Mechanical Advantage

400

A pulley system makes a person pull 5 meters of rope for each meter the load travels. What is the mechanical advantage of the system?

5

500
When I go running, what energy transformatino takes place?
Chemical energy is transformed to kinetic energy
500

CHALLANGE! The angle between the direction of the applied force on an object and the motion of the object must be less than what in order for work to be done?

90 degrees

500
Kevin exerts a force of 200 N over 40 m in 20 seconds. How much power does he use?
400 Watts
500
What happens to the input work on a machine that is not turned into output work?
It turns into heat
500
A wedge makes work easier by changing what? 

The direction of the force applied.