An aeroplane speeds up along a horizontal runway before take-off. It accelerates for 35 s. At the instant it leaves the ground, its speed is 72 m/s. Fig. 1.1 shows how the speed of the aeroplane changes between time t = 0 and t = 35 s.
Fig. 1.1 labels: the vertical axis is "speed m/s" and the horizontal axis is "t / s", with values from 0 to 35 on the time axis and from 0 to 72 on the speed axis.
(a)[1]
Define acceleration in physics.
(b(i))[1]
Calculate the average acceleration of the aeroplane between t = 0 and t = 35 s.
(b(ii))[2]
Calculate the average resultant force on the aeroplane between t = 0 and t = 35 s.
(b(iii))[1]
Give one possible reason for the change in the aeroplane’s acceleration between t = 0 and t = 35 s.
(b(iv))[3]
On Fig. 1.2, sketch a graph showing how the aircraft’s acceleration changes between t = 0 and t = 35 s.
Worked solution & mark scheme
This 8-mark question has a full step-by-step worked solution and mark scheme. One marking point: “change in velocity per unit time” …