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Law of Conservation of Energy
Potential Energy
Kinetic Energy
Work/Wild Card
Power
100

Energy can not be created or ______________

Destroyed

100

formula for gravitational potential energy

What is Ug= mgy Ug=mgh

100

A sled slides down a hill at constant velocity. What happens to the total mechanical energy of the sled as it slides down the hill. 

Total mechanical energy decreases.  

100

While he and his family are moving, Joshua drags his suitcase 12.64 m from the front door to the car at a constant speed. He does this with a horizontal force of 87.0 N. How much works does he do to over come friction??

What is 1100 J

100

While he and his family are moving, Joshua drags his suitcase 12.64 m from the front door to the car at a constant speed He does this with a horizontal force of 87.0 N. If he does all of this within 17 s, how much power has he put out??

What is 65 W

200

When you throw a ball in the air this is the position where kinetic and potential energy are proven to be equal

What is the midpoint

200
position where the potential energy is at its lowest
What is bottom
200

An sled is dragged up a hill at constant velocity.  What happens to the total mechanical energy of the sled as it is pulled up the slope?

mechanical energy increases

200

If Aimee does 5.1 J of work to move her dresser drawer a distance of 2.3 m, how much force did she have to exert??

What is 2.2 N

200
If Aimee does 5.1 J of work to move her dresser drawer a distance of 2.3 m and all of this is done in 8 s, how much power has been exerted??
What is .64 W
300

This type of energy increases as mechanical energy decreases.  

What is thermal energy

300
a compressed spring that obeys Hooke's law has a potential energy of 18 J. if the spring constant of the spring is 400 N/m, find the distance by which the spring is compressed.
What is .3 meters
300
A 4 kg ball is n a 5 m ledge, if i's pushed off, how much kinetic energy will it have just before hitting the ground??
What is 200 J
300

As the thermal (internal) energy of a system increases, the mechanical energy must ________________.

Decrease

300
A 60 watt bulb runs for 5 seconds. How much energy does it use??
What is 300 J
400

A spring is stretched a distance of 4 meters.  If the spring constant is 300 N/m, what is the force on the spring?

1200 N

400
a rolling ball has 18 J of kinetic energy and is rolling 3 m/s. find its mass.
What is 4 kg
400
A 2.3 kg mass attached to a horizontal mass-less spring with spring constant 54 N/m, is released 0.42 m from its equilibrium position. What is the mass' speed as it passes through its equilibrium position??
What is 2 m/s
400

A basketball is lifted above a players head and then dropped.  The moment before the ball strikes the ground the ball has 130 J of kinetic energy and 12 joules of thermal energy.  What is the work required to lift the ball above the players head?

142 J of work

400

You lift a 30N box with a vertical velocity of 1.3 m/s.  How much power is used to lift the box?

39 W

500

a 25 kg ball is thrown into the air, going 10 m/s. calculate how high it travels

What is 5 meters

500

A bow and arrow has 1,300 Joules of spring potential energy.  How high could this bow shoot an arrow with a mass of 0.200 kg?

650 meters

500

k = 100 J v = 2 m/s What is the object's mass??

What is 50 kg

500

Person A and Person B are competing against each other, they both can lift 75 kg boxes 3.5 m off of the ground. Person A lifts her box in 1.5 s and Person B lifts his box in 2.4 s. Which person does more work??

What is NEITHER

500
Person A and Person B are competing against each other, they both can lift 75 kg boxes 3.5 m off of the ground. Person A lifts her box in 1.5 s and Person B lifts his box in 2.4 s. Which person uses more power??
What is Person A