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Question
(a) State the law of conservation of energy.
(b) Name the type of energy possessed by stretched slinky, flowing water, stretched rubber band and a speeding car.
(c) An object of mass 50 kg is raised to a height of 600cm above the ground. What is its potential energy? (g = 10m/s2)
(a) State the law of conservation of energy.
(b) Name the type of energy possessed by stretched slinky, flowing water, stretched rubber band and a speeding car.
(c) An object of mass 50 kg is raised to a height of 600cm above the ground. What is its potential energy? (g = 10m/s2)
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Solution
a)
Law of conservation of energy: Total energy of this universe is conserved (is constant). Energy cannot be created nor be destroyed. But can be transformed from one form to another.
b)
A stretched slinky and stretched rubber band possesses elastic potential energy. Flowing water and speeding car possesses kinetic energy.
c)
Here, ‘m’ = 50 kg
Height from ground, h = 600 cm = 6 m
So, PE = mgh = (50)(10)(6) = 3000 J
a)
Law of conservation of energy: Total energy of this universe is conserved (is constant). Energy cannot be created nor be destroyed. But can be transformed from one form to another.
b)
A stretched slinky and stretched rubber band possesses elastic potential energy. Flowing water and speeding car possesses kinetic energy.
c)
Here, ‘m’ = 50 kg
Height from ground, h = 600 cm = 6 m
So, PE = mgh = (50)(10)(6) = 3000 J
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