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Manu Vatika Sr. Sec. School (Budhlada), , Class 9" (physics) ASSIGNMENT, , Chapter- work and energy, , , , , , , , 1. List two conditions which need to be satisfied for the work, to be done on an object., , 2.A girl is running along a circular path with a uniform, speed. How much work is done by the girl?, , 3. Moment of force and work done by a force have the same, units. Then, what is the difference between them?, , 4.A coolie is walking on a railway platform with a load of, 27 kg on his head. What is the amount of work done by, him?, , 5. What is the amount of work done by a man in pressing a, rigid wall with a force of 400 N?, , 6. State the law of conservation of energy., , 7. Name the two common forms of mechanical energy, , 8. What is negative work., , 9. What type of energy is stored in the spring of a watch?, , 10. Can kinetic energy of a body be negative?