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UNIT 6.3 WORK DONE AND ENERGY TRANSFERS

Mr S Lee Physics Year 11 Englisch 10 Karten

UNIT 6.3 WORK DONE AND ENERGY TRANSFERS

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  1. 1Work done = ?Work done (W) = Force (F) x Distance (D)
    Work done (W) is measured in Joules (J)
    Force (F) is measured in Newtons (N)
    The distance (D) moved is measured in meters (m) in the direction of the force applied.
  2. 2How much work is done when a box with a mass of 3 kg is lifted from the floor onto a 2.5 meter high shelf ? (Remember: The force of gravity on a mass of 1 kg = 10 N)W = F x D
    W = 30 x 2.5
    W = 75 J    How much work is done when a box with a mass of 3 kg is lifted from the floor onto a 2.5 meter high shelf ? (Remember: The force of gravi...
  3. 3If 270,000 J of work was done to move a car 40 m, what force was used?F = W ÷ D
    F = 270,000 ÷ 40
    F = 6,750 N    If 270,000 J of work was done to move a car 40 m, what force was used?If 270,000 J of work was done to move a car 40 m, what force was used?
  4. 4Calculate the kinetic energy of car, with a mass of 1,200 kg, travelling at 20 m/s.Calculate the kinetic energy of car, with a mass of 1,200 kg, travelling at 20 m/s.Calculate the kinetic energy of car, with a mass of 1,200 kg, travelling at 20 m/s.
  5. 5Calculate the speed of a cannonball, with a mass of 5.8 kg travelling with 23,490 J of kinetic energy.Calculate the speed of a cannonball, with a mass of 5.8 kg travelling with 23,490 J of kinetic energy.Calculate the speed of a cannonball, with a mass of 5.8 kg travelling with 23,490 J of kinetic energy.
  6. 6Calculate the potential energy of a rock with a mass of 1,350 kg, on top of a slope 7 m high.(Gravitational field strength on Earth =
    10 N/kg)
    Potential energy = 1,350 x 10 x 7
    Potential energy = 94,500 J    Calculate the potential energy of a rock with a mass of 1,350 kg, on top of a slope 7 m high.Calculate the potential energy of a rock with a mass of 1,350 kg, on top of a slope 7 m high.
  7. 7A crane can lift a weight of 2,250 N to a height of 23 m in 15 seconds. What is the power of the crane?Power =
    Work ÷ Time
    Power =
    (2,250 x 23) ÷ 15
    Power = 3,450 W    A crane can lift a weight of 2,250 N to a height of 23 m in 15 seconds. What is the power of the crane?A crane can lift a weight of 2,250 N to a height of 23 m in 15 seconds. What is the power of the crane?
  8. 8A force of 20 N stretches a spring by 0.5 m. Calculate the spring constant.F = k x
    F = Force measured in Newtons (N)
    k = Spring constant measured (N/m)
    x = extension measured in meters (m)
    Therefore k = F ÷ x
    k = 20 ÷ 0.5
    k = 40 N/m    A force of 20 N stretches a spring by 0.5 m. Calculate the spring constant.
  9. 9Complete the table below about car safety features and how they work.Complete the table below about car safety features and how they work.Complete the table below about car safety features and how they work.
  10. 10Describe and explain how the energy efficiency of vehicles can be improved by reducing idling losses.Stop–start systems reduce idling losses. If the car is stopped in traffic the engine shuts down automatically and then re-starts automatically when the accelerator is pressedDescribe and explain how the energy efficiency of vehicles can be improved by reducing idling losses.Describe and explain how the energy efficiency of vehicles can be improved by reducing idling losses.

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Beschreibung
This topic explores the relationship between work and energy. The equations for kinetic energy and change in gravitational potential energy are developed. The principles of force, energy and motion are used to analyse such safety features of cars as air bags and crumple zones.
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Mr S Lee
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