Show:
Work
Energy
Power
Conservation of Energy
100
What is the equation for work?

W = FΔx

100

What does ME stand for and what does it mean?

Mechanical energy, total energy

100

What is the equation for power with work in it?

P = W/t

100

What is the equation for mechanical energy?

ME = GPE + KE

200
Snowball the bunny hops up 4m of stairs. His mass is 4 kg. What do you need to do to these numbers BEFORE you can calculate work? What equation will you use?

convert the mass into weight using the equation w = mg

200

What is the law of conservation of energy?

energy cannot be created or destroyed; or total mechanical energy is conserved in a system

200

The unit for power is.....

Watts

200

When a pendulum swings, DRAW where the pendulum has the MOST kinetic energy? At this points is there any potential energy? yes or no.

See drawing. Should be at the center.

300

Steve does 2000 J of work over 20 m. How much force did he apply during that 20 m?

100 N

300

There are two kinds of potential energy. What are their abbreviations and what do they stand for?

GPE (gravitational potential energy); EPE (elastic potential energy)

300

If P = FV, and Julia runs at 2 m/s to produce 150 W. How much force did she produce?

75N

300
Sam drops her backpack on the ground. What is the equation for the mechanical energy of the bag halfway to the ground? HINT: Is there kinetic energy? Is there gravitational potential energy?

ME = GPE + KE

400

Frances uses 20 W of power while driving for 30 s. How much work did the car do?

600 J

400

Joey's refrigerator is more energy efficient than Frank's. What does this mean about Frank's refrigerator?

Frank's refrigerator looses more energy due to heat, sound, and friction.

400

Sarah does 1200 J of work for 1 minute. How much power does she produce?

20 W of power

400

A roller coaster sits at the top of a hill not in motion. What is the equation for its mechanical energy?

ME = GPE

500

Teagan produces 2000 J of work after running for 20 minutes. How far did she run, if she pulls with 20 N of force?

100 m

500

As a roller coaster goes up a hill the ___________ decreases and the _____________ increases.

Kinetic energy; gravitational potential energy

500
Thomas the snake uses 42 W of power while walking at 3 m/s for 16 minutes. How much force does he produce?

14 N

500

A roller coaster sits at the top of tall drop and then goes through a loop de loop to be level with the ground. At which point on the track is there the most energy in the system?

The energy is the same at every point in the system