In which of the following is work being done?
Correct answer: C. Sarah walking up the staircase
- A. Jack carrying a bucket of water along a horizontal road
- B. A skydiver falling with uniform velocity towards the ground
- C. Sarah walking up the staircase
- D. Asad swinging a marble tied to a string at uniform speed
Explanation
Work is defined as the force applied on an object causing displacement in the direction of the force. In option C, Sarah walking up the staircase involves applying a force against gravity, resulting in vertical displacement, hence work is done. In option A, Jack's vertical force does not cause horizontal displacement, so no work is done. Option B describes a skydiver with balanced forces, meaning no net force and thus no work done. In option D, the force is centripetal and perpendicular to the motion, so no work is done.
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Scientific reasoning evaluates hypotheses through observations, variables, controls, measurements and experimental results. Questions involve identifying independent and dependent variables, recognising a fair test, interpreting tables or graphs, distinguishing evidence from opinion, and deciding whether data supports, rejects or leaves a hypothesis unresolved.
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