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Brief Questions and Answers (3 marks each)
Q.1 Define work and its unit.
Q.2 Define Energy and write down its unit.
Q.3 Define kinetic energy and give at least one example.
Q.4 Define Potential Energy and give examples.
Q.5 Define Gravitational Potential Energy and give at least one example.
Q.6 Define Efficiency.
Q.7 What do you know about Ideal machine?
Q.8 Can we say that practical systems can be 100% efficient?
Q.9 Define Power. Write down its unit and define it.
Q.10 Do we do any work when we lift a load from the Earth to some height?
Q.11 How much power is used by a 40 kg athlete by climbing 10m high ladder in 10s?
Q.12 Give some examples of energies used in our body?
Q.13 How much work is done when a body moves with uniform velocity?