Module 3 Exam

Question 1

Explain how seatbelt reduces force

Answer 1

Time taken to stop is more or distance travelled is greater
F=change m/change t
Change m is the same so F is smaller

Question 2

Explain how air resistance affects motion of object

Answer 2

Initially only weight acts so object accelerates downwards F=ma
Increasing air resistance as velocity increases
Eventually air resistance becomes equal to weight of object, resulting in no net force