Impulse and force-momentum changeEdexcel International A Level Physics: Mind map

Exam questions on Impulse and force-momentum change

1. A tennis ball of mass 0.057 kg travels horizontally at 25 m s⁻¹ towards a racket. It is in contact with the racket for 5.0 ms and leaves in the opposite direction at 30 m s⁻¹.
   Calculate the average force exerted by the racket on the ball.2 marks
2. In a crash test a dummy of mass 75 kg is travelling at 14 m s⁻¹ in a car that stops suddenly. The seat belt brings the dummy to rest in 0.20 s.
   The airbag increases the stopping time to 0.50 s. Calculate the average force on the dummy now.2 marks
3. In Core Practical 9 a student investigates the relationship between the force on a trolley and its change of momentum. The trolley has mass 0.80 kg and is pulled along a track by a falling weight on a string. Light gates record its speed as 0.40 m s⁻¹ at the first gate and 1.20 m s⁻¹ at the second gate, and a data logger records 2.0 s between the gates.
   Calculate the change in momentum of the trolley between the gates and the average resultant force on it.3 marks