Answer the following
Q.1. Two bodies A and B of masses 10kg and 20kg respectively are at the same height above the ground.Which of the two has greater potential energy and why?
Q.2 Can a body possess energy even when it is not in motion? Explain your answer with an example.
Q.3 Why is it easier to walk on soft sand if we have flat shoes rather than shoes with sharp heels?
Answers
Answer:
Potential energy = mgh , where m is mass of body , g is acceleration due to gravity and h is given height
since both of the body are at same height above the ground , so the body having greater mass will have more potential energy
that is 20 kg body will have higher P.E
Answer:
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Explanation:
ans) 1)The body B having mass 20 kg has the greater potential energy. This can be explained as follows :P.E. = mgh . For both the bodies gravity and height are same so the body with greater mass possesses greater potential energy
ans)2) Yes, a body possesses energy even when it is not in motion ; Consider a body raised to a certain height say h. It its velocity is zero. Kinetic energy will be zero but the body will have. Thus, a body may possess energy even though it is not in motion.
ans) 3) itis easy to walk on sand with flat shoes and not high heels because the surface area of heels is less than that of flat footwear. Surface area is inversely proportional to pressure. So, we feel less pressure while walking with flat shoes of greater surface area.
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