Speed, velocity and accelerationIB MYP Physics: Mind map

Exam questions on Speed, velocity and acceleration

1. A runner in Kingston, Jamaica, completes one 400 m lap of an oval running track in 50 s. The track has two straight sections and two curved bends. A stopwatch measures the time for the whole lap.
   Even if the runner keeps a constant speed of 8 m/s, explain why her velocity changes as she runs round a bend.2 marks
2. A train leaves a station in Mumbai. It accelerates uniformly from rest to 20 m/s in 40 s on a straight track. Later, approaching the next station, it brakes uniformly from 20 m/s to rest in 10 s.
   Calculate the speed of the train 24 s after it leaves the station.2 marks
3. A student in Lagos investigates free fall. She drops a card 12.0 cm long through two light gates, one above the other. The first light gate records that the card blocks the beam for 0.060 s. The second light gate records that the card blocks the beam for 0.020 s. The time for the card to fall from the first light gate to the second is 0.40 s. The accepted value for the acceleration of free fall is 10 m/s².
   Calculate the speed of the card as it passes through the first light gate.3 marks