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How can an object accelerate without changing speed?

Acceleration is defined as the rate of change of velocity. Since velocity is a vector quantity (it has both magnitude and direction) defined as speed in a particular direction, any change in either speed or direction of travel is a change in velocity. Acceleration therefore occurs whenever an object changes direction- for example, a car driving around a roundabout is constantly accelerating even if its speed does not change.

Ellen M. GCSE Biology tutor, GCSE Physics tutor, GCSE Maths tutor, A ...

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Degree: Evolutionary Anthropology (Masters) - Oxford, Pembroke College University

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