IGCSE Physics Mock – Set 3 Paper 4-Updated 2026
IGCSE Physics Mock – Set 3 Paper 4 – Updated 2026
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Question
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.
As the ball begins to fall through the oil, it accelerates.
(a) Define acceleration.
(b) The mass of the ball is 0.0075kg. Calculate the resultant force acting on the ball when it is accelerating downwards at 2.8 \(m/s^2\) .
(c) As the ball falls, its speed v is recorded. Fig. 1.2 is the speed–time graph for the falling ball.
(i) Describe what happens to the acceleration between t = 0 and t = 0.040s. Explain why this happens.
(ii) By drawing a tangent on Fig. 1.2, determine a value for the acceleration of the ball at t = 0.010s.
▶️Answer/Explanation
(a) (acceleration is) rate of change in velocity OR change in velocity per unit time OR (a =)∆v / ∆t
(b) 0.021N
F = ma OR (F =) ma OR \(0.0075 \times2.8\)
(c)(i) 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
(ii) tangent drawn at t = 0.010 s
\(1.2m / s^2\) ⩽ acceleration⩽ \(1.8m / s^2\)
(a =) gradient of tangent OR (a =) {∆y / ∆x}