.5. Answer the following questions in short:-
(a) How will you measure the area of an irregular shape?
(b) Which unit of measurement you will use to find the area of –
(i) farmland (ii) your living room.
(c) What is a simple pendulum?
(d) Give one example of ‘Periodic motion’ and one of ‘Rotational motion’.
(e) Is it possible that a force is acting on a body but still the work done is zero?
Explain giving one example.
Answers
Explanation:
Ans: To find the area of irregular shapes, first we need to divide the irregular shape into regular shapes that you can recognize such as triangles, rectangles, circles, squares etc. Then, find the area of these individual shapes and add them up to get the area of irregular shapes..
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Answer:
(a) To find the area of irregular shapes, first we need to divide the irregular shape into regular shapes that you can recognize such as triangles, rectangles, circles, squares etc. Then, find the area of these individual shapes and add them up to get the area of irregular shapes.
(b)(i) acres (ii) meters
(c) A pendulum is a body suspended from a fixed support so that it swings freely back and forth under the influence of gravity. When a pendulum is displaced sideways from its resting, equilibrium position, it is subject to a restoring force due to gravity that will accelerate it back toward the equilibrium position.
(d) Periodic motion - rocking chair , Rotational motion - motors
(e) Yes, it is possible that a force is acting on a body and still the work done is zero. When a man is pushing a wall, work done is zero as there is no displacement.
Explanation:
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