GCSE Physics (AQA)

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Car Design

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Energy Conservation and dissipation of energy

Car Design

2:43 Reducing Energy Losses
Spec 4.1.2.1
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  • Car engines convert chemical energy to kinetic energy.
  • Chemical energy from fuel is converted to kinetic energy within the engine and wheels to move the car.
  • The engine provides the driving force, doing work to move the car forward.
  • The engine must work against resistive forces to keep the car in motion.
  • Resistive forces include friction in moving parts, tire-road friction, and air resistance (drag).
  • Kinetic energy is lost as work is done against friction and drag, converting it into heat.
  • A driving force is needed to maintain speed and replace lost kinetic energy.
  • Streamlining the car's body reduces work against air resistance by reducing collisions with air particles.
  • Streamlining reduces energy loss to resistive forces and heat, requiring less energy to replace lost kinetic energy.
  • Engines are designed to be energy efficient, converting most chemical energy to kinetic energy, with some loss to heat and sound.
  • Moving parts are lubricated to reduce friction and heat loss, allowing smoother movement.
  • Electric vehicles are more energy efficient with fewer moving parts.
  • Car design is a common example of a system involving energy changes, dissipated energy, and steps to reduce energy loss through heat and friction.

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