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Physics · May / June 2024 · Paper 41 · Question 1

0625

As printed in the paper

The question as text

A long tube contains oil. A small ball is held at rest at the surface of the oil. At time t = 0, the ball is released and begins to fall vertically through the oil. Fig. 1.1 shows the ball falling through the oil. ball oil Fig. 1.1 As the ball begins to fall through the oil, it accelerates.

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Show the answer and mark scheme

  • 1(a)[1]

    (acceleration is) rate of change in velocity OR change in velocity per unit time OR (a =) ∆v / ∆t

  • 1(b)[2]

    0.021 N

    F = ma OR (F =) ma OR 0.0075 × 2.8

  • 1(c)(i)[4]

    any four from:

    (acceleration) decreases
    (acceleration decreases) to zero (at approximately 0.03 s)
    resistive force increases / resistance increases (as speed / velocity increases)
    resultant force (downwards) decreases
    (until) terminal velocity / constant speed (is reached)
    (when) resistive force = weight OR resultant force is zero OR forces are balanced

  • 1(c)(ii)[3]

    tangent drawn at t = 0.010 s

    1.2 m / s2 ⩽ acceleration ⩽ 1.8 m / s2

    (a =) gradient of tangent OR (a =) {Δy / Δx}

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