What is work done in Physics? …

What is work done in Physics? Read the following situations: “Child A is preparing for exam in his study room at his table. Child B climbs a tree several feet high on the ground.” Who has done more work and why? A student is writing a three hours science paper. How much work is done by the student? Give reasons to your answer. State the SI unit of work. Express work mathematically. What would be the work done if (a) force on the object is zero? (b) displacement of the object is zero? A bullock is pulling a cart and the cart moves. Name the object which is doing work and the object on which work is done. A coolie is walking on a railway platform with a load of 30 kg on his head. How much work is done by coolie? State the conditions for zero work done. When is the work done by a body positive? When is the work done by a body negative? Give an example of negative work. What is meant by energy? List a few forms of energy. State the SI unit of energy. State the CGS unit of energy and relate it with its SI unit.

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