A hiker carries a heavy backpack. The mass of the backpack is 5.4 kg. Take the acceleration of free fall, ggg, as 9.8 m/s2.
Calculate the weight of the backpack.
The hiker carries the backpack from the ground level to the top of a flight of steps. The vertical height of the steps is 6.2 m.
Show that the work done against gravity on the backpack when it is carried to the top is approximately 330 J.
Determine the gravitational potential energy gained by the backpack and give a reason for your answer.
533 exam-style questions on CIE IGCSE Physics 1.7 Energy, work and power, covering 1.7.1a Energy stores and energy transfers, 1.7.1b Conservation of energy, 1.7.1c Kinetic and gravitational potential energy, 1.7.2 Work done, 1.7.3 Energy resources, 1.7.3a Energy resources and electricity generation, 1.7.3b Nuclear fusion as an energy source, 1.7.3c Efficiency of energy transfer, and 1.7.4 Power. Each one has a worked solution and a mark scheme showing where the marks go.