A mass hangs on a string fixed at point P. It starts from position 1 and swings to the furthest position on the opposite side, position 2. It then oscillates several times with decreasing amplitude before ending at position 3. Where does the ball have the most kinetic energy?
Correct answer: B. the first time at position 3
- A. at position 1
- B. the first time at position 3
- C. the last time at position 3
Explanation
At positions 1, 2 and finally (last time) coming to rest at 3, the speed of the ball is zero. The ball will undergo a few oscillations before coming to rest and so the speed of the ball when it is the first time at 3 will be maximum hence the kinetic energy will be maximum.
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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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