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Measurement and Kinematics

Quick questions on Speed, velocity and acceleration explained: O-Level Physics

5short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is acceleration?
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Acceleration is how quickly velocity changes. It is a vector, with unit metre per second squared, m s−2\text{m s}^{-2}:
What is wrong units for acceleration?
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Acceleration is in m s−2\text{m s}^{-2}, not m s−1\text{m s}^{-1}.
What is q1?
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A runner covers 400 m400\ \text{m} in 50 s50\ \text{s}. Calculate the average speed. [2 marks]
What is q2?
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A car accelerates from 8.0 m s−18.0\ \text{m s}^{-1} to 20 m s−120\ \text{m s}^{-1} in 6.0 s6.0\ \text{s}. Calculate the acceleration. [2 marks]
What is q3?
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Explain why an object moving at constant speed around a circle still has a changing velocity. [2 marks]

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