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c.  heat energy

               d.  potential energy














               SUBJECTIVE
               1. What type of energy is stored in the spring of a watch?
               2. Which energy does a flying bird possess?

               3. Give one example each of potential energy (i) due to position (ii) due to shape.
               4. Does the gravitational potential energy of a body depend on the path along which the
               body is moved, while going from one point to another? Illustrate your answer with the
               help of suitable example?
               NUMERICALS (Board)

               1. What will be the potential energy of an object of mass 6 kg at height of 10 m from the
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               ground? (g = 10 ms )
               2. An object with 100 N weights is raised to a height of 15m. Find the potential energy
               possessed by the object at that height. Also find the new potential energy:
               a. If the same object is raised half of its original height.
               b. If the same object is raised to three times of its original height?
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               Given g=10m/s
               3. An object of mass 10 kg possesses a potential energy of 430 J. Find the height of the
               object above the ground?

               4. A body of mass m kg is lifted by a man to a height of 1 m in 30 seconds, while
               another man lifts the same in 60 seconds. Find the ratio of the work done by them?
               5.An object of mass 20 kg is thrown vertically upwards with a velocity of 100 m/s. Find
               its potential energy at a point 15m above the ground?











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