4782512
Description
Flashcards by Fadlan Alhamid, updated more than 1 year ago
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Created by Fadlan Alhamid
about 8 years ago
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| Question | Answer |
| what happens when a force moves something | WORK is done |
| What is the definition of work? | work is a measure of the amount of energy used in a moving object |
| what is the formula of work done | force x distance or W=F x D |
| The definition of Power? | Power is the rate that work is done or how fast energy is used. |
| The formula of Power | work done divided by the time taken |
| The energy of a moving object is called________. | Kinetic energy Ek |
| How is kinetic calculated with what equation | kinetic= 0.5 m x v squared |
| what happens when you double mass of a moving object | Doubles its kinetic energy |
| what is the risk of death compared with travelling at 60km/h | Speed=75 = 11 times |
| Give me another reason why increased speed is more dangerous | Travelling a higher speed requires more time and longer distance to stop fully |
| what would happen if he was travelling at 80km/h and wants to stop | impact at 78km/h would take 58m to stop |
| the meaning of potential energy | energy that an object has because of its positioning or structure eg. chemicals in food and explosives |
| what is elastic potential energy | a stretched or elastic material is elastic potential energy |
| eg of elastic potential energy | springs on trampoline, car bumpers and many more |
| what is gravitational potential energy | an object above the ground has gravitational energy calculated in = mgh |
| eg of gravitational energy | tree branch has its energy if it falls it will do work on any car it hits the branch does the work on the car because it moves it |
| what is the law of conservation energy | it states that energy may be transferred from one object to another but never created or destroyed |
| what is efficiency of an energy | a conservation is a measure of how much useful energy is produced |
| the formula of efficiency | = useful E divided by total energy x 100% |
| what happens when you use wires , cables to charge up electronic devices | some energy lost as it is wasted heat energy |
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