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Work, energy and power

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Work, energy and power

1. 1. By:Felix
2. 2.  Work is done when a force moves the point at which it acts in the direction of the force. Work done = force * distance Work done = pressure * change in volume Work done is measured in Joule, while force is in Newton and distance is in meter. Pressure is in Pascal and change in volume is in m3.
3. 3.  Potential energy is the ability of an object to do work as a result of its position or shape. Elastic potential energy is the potential energy owned by a string when it is strained. Electric potential energy is the potential energy stored by things with electrical charges. Gravitational potential energy is the potential energy of two masses when they are pulled apart. Gravitational energy (Joule) = mass(kg)* gravity(ms-2)*height(meter)
4. 4. Ep=m*g*h
5. 5.  Kinetic energy is energy due to motion. Kinetic energy(Joule)= ½ *mass(kg)* velocity2(m2s-2) Efficiency gives a measure of how much of the total energy may be used and is not lost. Efficiency = useful work done/total input
6. 6.  Hooke’s law states that, provided the elastic limit is not exceeded, the extension of a body is proportional to the applied. Force (N) = constant (Nm-1) * change in length(m) Strain energy is the energy stored in a body due to change of shape. Strain energy(Joule) = ½ * constant(Nm- 1)*change in length2(m2)
7. 7.  Strain is the ratio of two lengths and does no have a unit. Strain = extension(m)/original length(m) Stress is the pressure needed to cause a certain extension to an object. Stress(Pa) = force(N)/area parallel to the force(m2) Young modulus(Pa) = stress(Pa)/strain
8. 8. Ductile material
9. 9. Brittle material
10. 10. Polymeric material showingelastic hysteresis
11. 11.  The numerical value of the specific heat capacity of a substance is the quantity of heat energy required to raise the temperature of unit mass of the substance by one degree. Energy(Joule) = mass(kg)*specific heat capacity(Jkg-1K-1)*change in temperature(C)
12. 12.  The numerical value of the thermal capacity of a body is the quantity of heat energy required to raise the temperature of the whole body by one degree. Energy(Joule) = thermal capacity(JK- 1)*change in temperature(C)
13. 13.  The numerical value of the specific latent heat of fusion is the quantity of heat energy required to convert unit mass of solid to liquid without any change in temperature. Energy(Joule) = mass(kg)*Latent energy of fusion(Jkg-1)
14. 14.  The numerical value of the specific latent heat of vaporization is the quantity of heat energy required to convert unit mass of liquid to vapor without any change in temperature. Energy(Joule) = mass(kg)*specific latent heat of vaporization(Jkg-1)
15. 15.  Power is the rate of doing work. Power(Watt) = work done(Joule)/time taken(second) Power(Watt) = force(N)*speed(ms-1)