SCIENCE
PHYSICAL SCIENCES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A student sleeps
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A student pushes a locked door that does not move
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a student carries his chair into another room
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A student sits on the carpet
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Detailed explanation-1: -Work is done when an object moves through some distance due to the force applied to it.
Detailed explanation-2: -Examples of works : Pushing a car horizontally from rest; shooting a bullet (the powder does the work); walking up stairs; sawing a log. Was this answer helpful?
Detailed explanation-3: -If a block moves on a smooth horizontal surface, no work is done. If you push a wall, but it doesn’t move, then no work is done. Sleeping for many hours is also an example of no work done. If you carry two bags in your hands and are not moving, then no work is done.
Detailed explanation-4: -Which of the following is the best example of work being done on an object? Work is force that transfers energy or movement between a system and its surroundings. In this case the work is moving the grocery bag.