1. Put this list in order of
difficulty to stop:
Golf ball
Rugby ball
bowling ball
Cricket ball
Football
What makes one ball more difficult to stop than another?

2. Baseline (Aiming for 4): Apply the
equation p=mv to find the momentum, velocity and mass
of an object.
Further (Aiming for 6): Describe how the principal of conservation of momentum can be used to find the velocities of objects.
Challenge (Aiming for 8): Apply the principals of conservation of momentum to a range of calculations involving the velocities of objects.

3. Exam question answers M1. (a) (i) 10800
allow 1 mark for correct substitution i.e. 900 × 12 2
(ii)     arrow pointing towards the left
allow anywhere on the diagram or at bottom of the page 1
(b)     zero
accept 0 / none / nothing
          velocity is zero
accept speed for velocity
accept stopped / not moving
accept a calculation i.e. 900 × 0 = 0
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