Does the work done in raising an object vertically depend upon how fast is raised?
Q.1. Does the work done in raising an object vertically depend upon how fast is raised?
Ans. No, because work done is independent of time.
Q.2. A porter moving vertically upstairs with a load on his head does work. Why?
Ans. The angle between the displacement of the porter and the weight of the load is 180°, hence work done is not zero.
Q.3. What is the work done by the tension in the string of a simple pendulum?
Ans. Tension acts perpendicular to the displacement of the simple pendulum hence work done is zero.
Q.4. In a tug-of-war one team gives way to the other. What work is being done and by whom?
Ans. The winning team does work. The work is equal to the product of the resultant force and the displacement undergone by the losing team.
Q.5. State the law of conservation of energy.
Ans. It states that energy can neither be created nor destroyed. It can only change form.
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