Flashcards
Work, Energy, and Power
Cards in this deck (17)
- 1EnergyThe ability of a body to do work.
Unit = Joule (J)
Symbol = E - 2WorkThe product of force and displacement in the direction of the force.
Unit = joule (J)
Symbol = W
W = Fs - 3JouleThe amount of work done when a force of 1 newton is applied over a distance of 1 metre.
Equal to a newton-metre (Nm = J) - 4Work is only done when:1. A force acts on a body continuously.
2. The displacement through which the object moves is in the direction of the force.
3. There is a resistance to the motion of the object - 5SystemThe matter that has been specified for study and experimentation
- 6Kinetic EnergyThe energy that a body has by virtue of its motion
Ek = 1/2mv2 (parabolic equation) - 7Gravitational Potential EnergyThe energy a body has by virtue by its position.
Ep = mgh
It is inversely proportional to height (gradient = weight) - 8PowerThe rate at which work is done.
Symbol: P
P = W/t
Unit: Watt - 9WattThe unit of power used when 1 joule of work is done in 1 second.
- 10UNITS: 1. Energy 2. Work 3. Mass 4. ForceANSWERS:
1. J (joule)
2. J (joule)
3. kg (kilogram)
4. N (newton) - 11Law of conservation of energyEnergy cannot be created or destroyed but can be transformed into an equivalent amount of another form of energy.
- 12The principle of conservation of mechanical energyFor an isolated system the sum of the gravitational potential energy and the kinetic energy of a body in a vertical plane remains constant.
- 13Elastic collisionOne which both kinetic energy and momentum are conserved.
- 14Inelastic collisionOne in which momentum is conserved but kinetic energy is not.
- 15Elastic collision- No distortion takes place.
- Ek before collision is equal to the Ek after collision. - 16Inelastic collision- E.g. 2 cars colliding, the total Ek of the system is reduced because it is converted into other forms of energy (heat and sound energy).
- In all inelastic collisions, the total Ek afer the collision is less than the total Ek before. - 17EfficiencyDuring energy production, much energy is lost as heat caused by friction of the moving parts of the generator and heat energy lost to the atmosphere by radiation, convection and conduction.
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- Cambridge IGCSE Chemistry, Biology and Physics Flashcards on Work, Energy, and Power, created by Taylor Smith on 30/05/2014.
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- Taylor Smith
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