954592
Description
Flashcards by Taylor Smith, updated more than 1 year ago
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Created by Taylor Smith
over 10 years ago
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| Question | Answer |
| Energy | The ability of a body to do work. Unit = Joule (J) Symbol = E |
| Work | The product of force and displacement in the direction of the force. Unit = joule (J) Symbol = W W = Fs |
| Joule | The 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) |
| Work 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 |
| System | The matter that has been specified for study and experimentation |
| Kinetic Energy | The energy that a body has by virtue of its motion Ek = 1/2mv2 (parabolic equation) |
| Gravitational Potential Energy | The energy a body has by virtue by its position. Ep = mgh It is inversely proportional to height (gradient = weight) |
| Power | The rate at which work is done. Symbol: P P = W/t Unit: Watt |
| Watt | The unit of power used when 1 joule of work is done in 1 second. |
| UNITS: 1. Energy 2. Work 3. Mass 4. Force | ANSWERS: 1. J (joule) 2. J (joule) 3. kg (kilogram) 4. N (newton) |
| Law of conservation of energy | Energy cannot be created or destroyed but can be transformed into an equivalent amount of another form of energy. |
| The principle of conservation of mechanical energy | For an isolated system the sum of the gravitational potential energy and the kinetic energy of a body in a vertical plane remains constant. |
| Elastic collision | One which both kinetic energy and momentum are conserved. |
| Inelastic collision | One in which momentum is conserved but kinetic energy is not. |
| Elastic collision | - No distortion takes place. - Ek before collision is equal to the Ek after collision. |
| Inelastic 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. |
| Efficiency | During 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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