876339
Descrição
Mapa Mental por Scott Heiron, atualizado more than 1 year ago
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Criado por Scott Heiron
quase 10 anos atrás
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Chapter 7. Work,
energy and power
- Doing work, transferring energy
- Factors for doing work
- The size of the force F -
bigger the force, greater work
- The distance travelled x -
Further distance, more work
- The size of the force F -
bigger the force, greater work
- Work done = force x distance
moved in direction of force
- W=Fx
- Work in Nm (Newton metres) or J (Joules)
- Work Done = Energy transferred
- If F at angle theta to direction of
motion then W = FxCos(theta)
- W=Fx
- Change in GPE = Weight x Change in height
- Ep = mgh
- Ep = mgh
- Faster an object, greater kinetic energy
- Kinetic energy = 0.5 x mass x speed^2
- Ek = 0.5mv^2
- Ek = 0.5mv^2
- Kinetic energy = 0.5 x mass x speed^2
- If no energy is lost during energy transfer
then Change in GPE = Change in KE
- mgh = 0.5mv^2
- mgh = 0.5mv^2
- Factors for doing work
- Energy transfers and conservation
- Energy efficiency = (Useful output
energy / Total input energy) x 100%
- Sankey diagram can
represent energy transfer
- Conservation of energy - The total energy at the
beginning = Total energy at the end in a closed system
- Energy efficiency = (Useful output
energy / Total input energy) x 100%
- Power
- Power is the rate at which work is done
- P = W / t
- Power measured in Watts
(W) (Joules per second)
- P = W / t
- Power is the rate at which work is done
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