IB Physics SL A.1.7 Uniform versus non-uniform acceleration Question Bank

Practise IB Physics SL A.1.7 by distinguishing uniform and non-uniform acceleration from motion data and graphs.

Exam points

Identify whether acceleration is uniform from equal-time displacement, velocity or acceleration data.
Interpret a changing acceleration graph and describe its effect on velocity or displacement.
Explain why a resistive force can make an object’s acceleration non-uniform.

[Maximum number: 2]

This question is in two parts. Part 1 is about the motion of a ship. Part 2 is about melting ice.

The ship's engines are switched off and the ship comes to rest from a speed of $7 \mathrm{~m} \mathrm{~s}^{-1}$ in a time of 650 s .

It is unlikely that the acceleration of the ship will be uniform given that the resistive force acting on the ship depends on the speed of the ship. Using the axes, sketch a graph to show how the speed v varies with time t after the ship's engines are switched off.

Figure for Question A.1.7—Uniform vs non-uniform acceleration question 1 — IB Physics SL

starts at $7.0 / 7.2 \mathrm{~m} \mathrm{~s}^{-1}$ ; (allow ECF from (d)(i)) correct shape;

Figure for Answer to Question A.1.7—Uniform vs non-uniform acceleration question 1 — IB Physics SL

Part 2 Melting ice

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A.1.7—Uniform vs non-uniform acceleration question 1