Work
Kinetic Energy
Gravitational Potential Energy
Energy
Misc
100
What is the formula for work?
Work = force * displacement
W = F * d
100
What is the formula for kinetic energy?
KE = (1/2)mv^2
100
What is the formula for GPE?
GPE = mgh
100
A ball rolls down a hill. State the energy transformation from the start to the end for the ball.
GPE > KE
100
What is the formula for energy efficiency?
e = (Useful Energy Output/Total Energy Input)*100
200
You push a box using a force of 50N over a distance of 3m, how much work was done?
150 J
200
A 5 kg ball is thrown at 10m/s. What is the kinetic energy of this ball?
250 J
200
A 0.1kg balloon has is floating at 45m in the air. How much GPE does it have?
45 J (using g = 10)
44.1 J (using g = 9.8)
200
Friction converts kinetic energy into what kind of energy?
Thermal energy
200
What are two properties of an object that GPE is linearly related to?
mass and height of the object
300
How much work have you done after pushing on a wall with 100N of force for 20 seconds, but it does not budge?
0 J
300
A 1000 kg car has 50,000 J of kinetic energy. What speed is it traveling at?
10 m/s
300
A car is sitting on top of a 20m hill with 10000 J of GPE. How heavy is this car?
50 kg
300
As you swim in a pool, you feel the flowing water cooling you down. What kind of heat transfer is this?
Convection
300
Name three different alternative energy resources.
Fuel cells, solar, nuclear, hydroelectric, wind, marine/wave, pumped hydro storage, geothermal, pavegen, biomass/biofuel
400
How much work is done by a 5 kg ball falling for 10 seconds at a speed of 20m/s?
10000 J
400
If the speed of an object doubles, how much does the kinetic energy change by?
4 times
400
A 20 kg cart on a roller coaster, first drops you 20 meters then you rise 5 meters before dropping another 15 meters. How much more GPE do you have at the beginning as compared to the end of the roller coaster?
6000 J (using g = 10)
5880 J (using g = 9.8)
400
As you jump on a trampoline, list three forms of energy that are present.
Elastic potential energy, kinetic energy, gravitational potential energy, sound energy, chemical potential energy
400
A ball starts on a 100m hill with 6000 J of potential energy and rolls down to the bottom in 10 seconds. If there is no friction, how much kinetic energy does it have at the bottom of the hill?
6000 J
500
You push a box with 20N of force and then let go. The box travels 10m while you are pushing and then continues to move 5m before stopping due to friction. How much work did you do on the box?
200 J
500
Two cars are traveling down a highway. Car A is 9 times heavier than Car B, but Car B is going 3 times faster than Car A. Which car has more kinetic energy?
Neither they have the same
500
The moon has gravity that is 1/6th as strong as Earth. How much less GPE does an object at 5m above the moon have as compared to 5m above Earth?
The GPE on the moon is 1/6th the GPE on Earth
500
As you jump on a trampoline, what are two energy transformations involved?
Some possible answers:
Chemical potential > kinetic
Elastic potential > kinetic
Gravitational potential > kinetic
500
What would a plot of KE vs v^2 look like? Draw it on your board.
