Each question= 2 or 3 marks
1. What happens to the work done when the displacement of a body is at right angles to the direction of force acting on it? Explain your answer.
2. When a ball is thrown inside a bus does its kinetic energy depends on the speed of the bus? Explain.
3. Derive the expression for kinetic energy.
4. State and prove work energy theorem.
5. A body of mass m is moving in a circular path of radius r with constant speed v. Find the work is done by the body after completing one revolution.
6. Work done in the motion of a body over a closed loop is zero for every force in nature, is it true?
7. State and prove law of conservation of energy in case of freely falling body.
8. If the linear momentum of a body is increased by 50% , by what percentage will the kinetic energy be increased?
9. If the kinetic energy of a body is increased by 300% by what percent is will the momentum be increased ?
10. When a Arrow is short from its BOW, it has kinitic energy. From where does it get the kinetic energy?
Solution: See Solution in bengali language
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