IB Physics HL A.1.9 Fluid resistance and non-ideal trajectories Question Bank

Practise IB Physics HL A.1.9 by analysing speed-dependent resistance and its effect on trajectories and terminal motion.

Exam points

Analyse how drag changes acceleration and the shape of a projectile trajectory.
Use a graph to identify terminal speed and the changing balance of weight and resistive force.
Evaluate an ideal no-drag model against the observed motion and state when it fails.

[Maximum number: 2]

A football player kicks a stationary ball of mass 0.45 kg towards a wall. The initial speed of the ball after the kick is $19 \mathrm{~m} \mathrm{~s}^{-1}$ and the ball does not rotate. Air resistance is negligible and there is no wind.

Figure for Question A.1.9—Fluid resistance on projectiles question 1 — IB Physics HL

In practice, air resistance affects the ball. Outline the effect that air resistance has on the vertical acceleration of the ball. Take the direction of the acceleration due to gravity to be positive.

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A.1.9—Fluid resistance on projectiles question 1