E Answer the following questions briefly.
11. Why do we need standard units for measurement?
2. What is periodic motion? Give one example seen in nature.
3. What is rotational motion? Give an example from your daily life.
4. The measurements given below are incomplete. Complete them.
(a) The length of Ryan's hair is 10.
(b) The bus took a long time, close to 30, to reach school.
Answers
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ANSWERS:
11) A unit of measurement which has a fixed value which does not change from person to person or place to place, is called a standard unit of length. It is necessary to have standard units of measurements for the sake of uniformity in measurements.
2) Periodic motion, in physics, motion repeated in equal intervals of time. Periodic motion is performed, for example, by a rocking chair, a bouncing ball, a vibrating tuning fork, a swing in motion, the Earth in its orbit around the Sun, and a water wave.
3)A person performing a Somersault, is an example of rotational motion. When we open a cap of any soda bottle, it jumps up in the air because of pressure released and is an example of rotational motion. Fan moving in the house, table fan, hand blender's blades motion are all examples of rotational motion.