Physics 9702 · AS & A Level · Momentum and Newton's laws of motion

Momentum and Newton's laws of motion — practice question

A ball with mass $150\,\text{g}$ is stationary on a horizontal floor, as shown in Fig. 3.1.
(a(i))[1]

Calculate the magnitude of the normal contact force exerted by the floor on the ball.

(a(ii))[1]

Explain the steps you used in (i).

(b(i))[1]

State the law of motion known as Newton’s second law.

(b(ii))[3]

Calculate the average resultant force on the ball while it is in contact with the floor.

(b(iii))[2]

State and explain if linear momentum is conserved in the collision between the ball and the floor.

(i)[1]

State the law known as Newton’s second law of motion.

(ii)[3]

Calculate the average resultant force on the ball during contact with the floor. State both the force’s magnitude and its direction.

(iii)[2]

State and explain if linear momentum is conserved in the collision between the ball and the floor.

Worked solution & mark scheme

This 14-mark question has a full step-by-step worked solution and mark scheme. One marking point: Therefore, Force $= mg = 0.15 \times 9.81 = 1.5\ \text{N}$

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