A-LevelPhysicsDynamics9702/12 · May/June 2016 · Q101 Mark
A sphere falls from rest through the air. The graph shows the variation with time of the sphere's velocity. [Figure 10.1] Which diagram shows the forces acting on the sphere when it is at the velocity corresponding to point P on the graph?
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Adiagram showing a sphere with air resistance pointing downwards and weight pointing downwards.
Bdiagram showing a sphere with air resistance pointing upwards and weight pointing downwards, with the weight vector longer than the air resistance vector.
Cdiagram showing a sphere with air resistance pointing upwards and weight pointing downwards, with the weight vector equal in length to the air resistance vector.
Ddiagram showing a sphere with air resistance pointing upwards and weight pointing upwards.
✓ Correct answer
C: diagram showing a sphere with air resistance pointing upwards and weight pointing downwards, with the weight vector equal in length to the air resistance vector.
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