What is the difference between potential and kinetic energy?
Potential energy is stored energy, kinetic energy is moving energy
200
Which of the following is an example of work, according to the scientific definition:
Writing an essay
Running a mile around the track
Lifting a feather off the ground
Lifting a feather off the ground
200
What is the equation for power?
P= w/t
200
A wind turbine converts ________________ energy to ________________ energy.
Mechanical, electromagnetic
200
What are the TWO possible formulas for potential energy?
PE = mgh OR PE = Wh
300
A woman who weighs 500N climbs a 10m ladder. A man who weighs twice as much climbs a ladder half as high. Who does more work?
They both do the same amount of work.
300
Raising a heavy load requires power. If it is raised it in half the time, the power required is ________ as much.
Twice
300
The law of conservation of energy states that energy cannot be ___________ or __________, it can only ___________ forms.
Created, destroyed, change
300
What is the potential energy of a block that weighs 300 N and is raised 4 m above the ground?
1200 J
400
What is the unit for work?
Joules or kg*m^2/s^2
400
Calculate the power used when a 20 N force pushes a cart 2 m in the time of 4 seconds.
10 W
400
A kid stands on the high dive and has 600 J of potential energy. He jumps, and a few feet before he hits the surface his potential energy is 100 J. What is his kinetic energy?
500 J
400
Find the kinetic energy of a 2 kg baseball moving at 3 m/s.
9 Joules
500
How much work is done on a 200 kg crate that is raised a vertical distance of 3 m?
6000 J
500
A car’s engine uses 5000 W of power to drive it up a hill in 3 seconds. How much work was done?
15000 J
500
A skateboarder down a ramp. His kinetic energy is 500 J at the bottom. What is his potential AND kinetic energy at the top AND halfway down the ramp?