What type of energy is stored in fuels such as coal?
Chemical energy
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15
You're curling dumbells. You transfer 110 J of energy (work done) in 2 seconds. What is your power?
55 W [ power = work done / time ]
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15
Friction is a force which transfers energy in what form?
Thermal (heat) energy
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15
By what process does heat energy move through a solid?
Conduction
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15
A roller coaster has 2500J of gravitational energy at the top of a loop. (assuming there is no friction) How much Kinetic energy does it have on the ground at the bottom of the loop?
2500J
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seesaw
Swap points!
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star
Double points!
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gift
Win 15 points!
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baam
Lose 15 points!
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15
Name 3 sources of renewable energy
wind, solar, wave, tidal, geothermal, gravitational potential energy
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15
An elastic band with a spring constant of 1.2 J/m is stretch 14 cm. How much elastic potential energy does it store?
0.01J
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15
Can energy be created?
No, only stored or transferred
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15
A cyclist uses their brakes. What are you calculating if you times the friction force by the distance covered whilst braking?
Work done / energy transferred [Work done = force x distance]
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banana
Go to last place!
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rocket
Go to first place!
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rocket
Go to first place!
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baam
Lose 20 points!
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15
What is the equation to calculate elastic potential energy?
E = 1/2 k e2
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15
Power is the rate of work done. [True/false]
True
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boom
Lose 50 points!
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gift
Win 25 points!
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rocket
Go to first place!
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baam
Lose 5 points!
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15
When a tennis ball is drop it transfers gravitational potential energy into which type of energy?