1. Higher Tier Only 

i) Figure 14 shows the vertical forces on an aeroplane.

Figure 14

Use information from the diagram to determine the size and direction of the resultant vertical force on the aeroplane.

size = ................. kN, direction is ...............[2]

ii) The aeroplane is descending.

Figure 15 shows a diagram of the resultant vertical and horizontal forces on the aeroplane as it is descending.

Figure 15

Complete the diagram to show the resultant of these two forces.

[1]

iii) The mass of the aeroplane is 750 kg.

Calculate the change in gravitational potential energy of the aeroplane as it descends from 1300 m to the ground.

Gravitational field strength (g) = 10 N/kg

energy = ........................... J[2]