Chapter 7. Work, energy and power

Scott Heiron
Mind Map by Scott Heiron, updated more than 1 year ago
Scott Heiron
Created by Scott Heiron about 7 years ago


Chapter 7. Work, energy and power in physics G481

Resource summary

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


                              Resumo para o exame nacional - Felizmente Há Luar!
                              GCSE Biology AQA
                              An Inspector Calls: Mrs Sybil Birling
                              Rattan Bhorjee
                              GCSE AQA Physics - Unit 3
                              James Jolliffe
                              Ingeniería Industrial
                              JUAN ADUNA RIVERA
                              Mapa Mental para Resumir y Conectar Ideas
                              ulises leon
                              Tipos de luz
                              Yiseth M. A
                              unidad 3 -DIBUJO DEL CONJUNTO- JUAN SUAREZ
                              Juan Carlos Suarez Gomez
                              Valores Eticos UTN
                              EVELYN PERUGACHI
                              Reto 2 Apropiacion Unadista
                              Lilibeth Polo Porto
                              Fundamentos de física conceptual
                              Axel Donovan Rodriguez Gonzalez