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MomentumIB MYP Physics: Flashcards

What these 13 flashcards ask

  • Write the equation for momentum.
  • What is the unit of momentum?
  • Is momentum a scalar or a vector?
  • What is the momentum of a 2.0 kg object moving at 5.0 m/s?
  • State the conservation of momentum.
  • What is the total momentum of two objects at rest that push apart?
  • Why do two objects pushed apart from rest move in opposite directions?
  • A 1.0 kg trolley at 4.0 m/s sticks to a 3.0 kg trolley at rest. What is the velocity after?
  • Write force in terms of momentum.
  • A momentum change of 300 kg m/s takes 0.50 s. What is the force?
  • Why do crumple zones reduce injuries?
  • Why do air bags reduce injuries?
  • Is kinetic energy always conserved in a collision?

Exam questions on Momentum

  1. A cricket coach in Chennai studies a ball of mass 0.16 kg that is bowled along a straight line at 30 m/s towards a batter. The batter hits the ball straight back along the same line at the same speed.
    Taking the direction in which the ball was bowled as positive, state the momentum of the ball after it is hit. Explain why it is different from the momentum before, although the speed is the same.2 marks
  2. Two trolleys are on a level, low-friction laboratory track. Trolley X has a mass of 2.0 kg and moves at 3.0 m/s towards trolley Y, which has a mass of 1.0 kg and is at rest. When they collide they stick together and move off along the track as one object.
    Calculate the velocity of the two trolleys just after the collision.2 marks
  3. A group of students investigates how the force on a hand catching a ball depends on the time the ball takes to stop. A ball of mass 0.40 kg is thrown at 5.0 m/s into a hand holding a force sensor. When the hand is held rigid, the ball stops in 0.05 s. When the hand moves backwards with the ball, the ball stops in 0.20 s.
    State the independent variable and the dependent variable. Write a testable hypothesis for this investigation and give a scientific reason for it.3 marks
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Written by the Exaim team, led by Shaun Daswani (Head of Upper Secondary, Improve ME Institute; MSc Financial Mathematics, Imperial College London; BSc, UCL) and Jason Daswani (operational lead, Improve ME Institute; LSE).