Work, energy and the conservation of energyEdexcel A-Level Physics: Mind map

Exam questions on Work, energy and the conservation of energy

1. A traveller pulls a suitcase 20 m along a level airport floor using a handle. The handle is held at 30° above the horizontal and the pulling force is a constant 60 N. The suitcase moves at a constant speed.
   Calculate the frictional force acting on the suitcase.2 marks
2. A child releases a toy car of mass 0.30 kg from rest at the top of a straight ramp. The top of the ramp is 0.80 m above the floor. Take g = 9.81 N kg⁻¹.
   In practice the car reaches the bottom of the ramp at 3.2 m s⁻¹. Calculate the energy transferred to the surroundings as thermal energy.2 marks
3. A skier of mass 70 kg starts from rest at the top of a straight slope and skis down to the bottom. The bottom of the slope is 45 m lower than the top and the slope is 280 m long. At the bottom the skier's speed is 22 m s⁻¹. Take g = 9.81 N kg⁻¹.
   Calculate the gravitational potential energy lost by the skier, the kinetic energy gained, and the energy dissipated as thermal energy.3 marks