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14 Cards in this Set
- Front
- Back
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What statement is known as the principle of conservation of energy? |
Energy cannot be created or destroyed. |
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What is the equation for work done? |
Force × distance moved in the direction of the force. |
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For a force-distance graph the area under it is what? |
The area under the line of a force-distance graph represents the total work done. |
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What is Hooke's Law? |
Hooke's law is a principle of physics that states that the force (F) needed to extend or compress a spring by some distance X is proportional to that distance. |
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What is kinetic energy and what is it's equation? |
Kinetic energy is the energy of an object due to its motion. The faster an object moves,the more kinetic energy it has. Equation: 1/2mv^2 |
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What is potential energy and what is the equation for the work done to raise an object? |
Potential energy is the energy of an object due to its position. Equation: the work done to raise the object = force × distance moved (mg × change in h). |
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After an object falling through a vertical height (change in h), its kinetic energy is equal to its loss of potential energy. What is the equation for this? |
1/2mv^2 = mg×change in h |
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Power is defined as the rate of transfer of energy. What is it's units and what is it equal to? |
The unit of power is the watt (W). It is equal to an energy transfer rate of 1 joule per second. |
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What is the equation for an object's gain in potential energy? |
Objects gain of potential energy= objects weight × total height gain. |
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What is the equation for frictional force? |
Work done to overcome friction ÷ distance moved. |
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When a powered object moves at constant velocity at constant height the resistive forces are equal and opposite to the motive force. What is the equation for this? |
The work done per second= force × distance moved per second. P=Fv |
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What is the equation for the motive power? |
Motive power= Energy per second wasted due to the resistive force + the gain of kinetic energy per second. |
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What is the equation for the output power of a machine? |
P out= work done by the machine ÷ time taken |
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What is the equation of an efficiency of a machine? |
The efficiency of a machine = useful energy transferred by the machine ÷ energy supplied to the machine or work done by the machine ÷ energy supplied to the machine |
