Define force
State Newton’s third law of motion
State the relationship between $F_A$ and $F_B$
State the relationship between $t_A$ and $t_B$
Use your answers in (i) to show that the change in momentum of sphere A is equal in magnitude and opposite in direction to the change in momentum of sphere B
For the spheres in (b), Fig. 3.2 shows how the momentum of sphere A varies with time before, during and after its collision with sphere B. Fig. 3.2 also gives the momentum of sphere B before the collision. Complete Fig. 3.2 to show how the momentum of sphere B varies with time during and after its collision with sphere A.