Flashcards
OCR Gateway P3h
Flashcards do conjunto (9)
- 1P3h - The energy of games and theme rides.
- 2Gravitational Potential Energy (GPE)An object held above the ground has Gravitational Potential Energy.
The amount of GPE an object on Earth has depends on its: Mass and Height above the ground. - 3Continue...If an object is lifted, work is done against gravitational force.
GPE = mgh
or
GPE = m × g × h
GPE = the gravitational potential energy in joules, J
m = the mass in kilograms, kg
g = the gravitational field strength in newtons per kilogram, N/kg
h = the change in height in metres, m - 4Energy TransfersA bouncing ball converts GPE to Kinetic Energy and back to GPE.
It doesn't return to it's original height because energy is transferred. - 5Kinetic EnergyKE = ½ mv2
- 6Energy TransferWhen an object falls through the atmosphere at terminal speed:
its kinetic energy, KE, does not increase
gravitational potential energy, GPE is transferred to the surroundings as heat because of friction (air resistance). - 7How roller-coasters workThe riders at the top of a roller coaster ride have a lot of gravitational potential energy.
When the train is released, it converts GPE to kinetic energy as it falls.
This is shown in the formula:
loss in GPE = gain in KE - 8Continue...As the train falls:
GPE = KE … so … mgh = ½ mv2
Notice that m appears on both sides of the equation and can be cancelled out:
gh = ½ v2
This equation can be rearranged to give:
h = v2 ÷ 2g - 9The kinetic energy an object has depends on its: Mass – if the mass doubles, the KE doubles Speed – if the speed doubles, the KE quadruples (increases four times)..
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- FlashCards sobre OCR Gateway P3h, criado por Zaaaara em 29-05-2014.
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