work done

• What happens to the temperature of the box due to friction?

  The temperature increases
• What do scientists call the transfer of energy when a force is used to move an object?

  Work
• What is the alternative unit for work, equivalent to the joule?

  Newton meter
• How much work is done when a force of one newton moves an object by one meter?

  One joule of work
• What type of energy does a moving car possess?

  Kinetic energy store
• During braking, where is the car's kinetic energy transferred to?

  Thermal energy store of the brakes
• What happens to the temperature of the brakes during braking?

  The temperature increases
• When a person walks up a flight of stairs, against what force are they primarily working?

  The force of gravity
• What is another term for the force of gravity acting on a person?

  Their weight
• When calculating work done walking up stairs, why is only the vertical distance relevant?

  Weight acts vertically downwards
• When a person walks up stairs, to which energy store is their chemical energy transferred?

  Gravitational potential energy store
• What energy transfers occur when a car brakes?

  • Kinetic energy of the car is transferred to the thermal energy of the brakes.
  • The force of friction acts between the brake and the wheel.
  • The temperature of the brakes increases, and the car slows down.
• When an object moves upwards, what energy transfers occur?

  • Chemical energy is transferred to the gravitational potential energy store.
  • Only the vertical distance is relevant.
  • Work is done against the force of gravity (weight).