Moderate
Initially, four identical uniform blocks, each of mass 'm' and thickness 'h' are spread on a table. How much work is done on the hook in stacking them on top of one another?
Correct answer: D. 6mgh
- A. 2mgh
- B. 3mgh
- C. 4mgh
- D. 6mgh
Explanation
W=mg(0h)+mg(1h)+mg(2h)+mg(3h) = 0+mgh+2mgh+3mgh= 6mgh
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About Work and Energy
Work transfers energy when a force causes displacement, while kinetic energy, gravitational potential energy and power describe motion, position and the rate of energy transfer. The work-energy theorem links net work with change in kinetic energy, and efficiency accounts for energy losses rather than treating them as energy destruction.
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