The figure shows Ahmad, standing on an elevator which is moving front he fourteenth floor to the fourth floor. Ahmad initially stood on a weighing scale to see that his mass was 60kg at rest. If the acceleration of the elevator is 2m/s2, what reading does the scale show? (g=10m/s2)
Correct answer: C. 48kg
- A. 60kg
- B. 72kg
- C. 48kg
- D. 80kg
Explanation
When the elevator falls in the direction of gravity, the relative acceleration decreases from 10 to 8m/s2. If at 10m/s2, the reading was 60kg, then at 8m/s2, the reading is 60x8/10= 48kg
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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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