Fig. 2.1 displays a 70 kg dummy being used in a crash test to examine the safety of a new car. The sketch labels a barrier, windscreen, passenger compartment and dummy. The car travels towards a solid barrier at 20 m/s. It collides with the barrier and comes to a sudden halt.
(a(i))[2]
Calculate the momentum of the dummy just before the collision.
(a(ii))[1]
Determine the impulse needed to bring the dummy to rest.
(b)[2]
Calculate the deceleration of the passenger compartment.
(c)[2]
Calculate the average resultant force acting on the 70 kg dummy.
(d)[2]
Explain why this is beneficial for passenger safety.
Worked solution & mark scheme
This 9-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Apply p = mv” …