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Answers
Answer:
1) Speed is the distance traveled per unit time. The S.I unit of speed is m/s.
2) An object said to be in uniform motion when it covers equal distance in equal intervals of time. An object said to be in non-uniform motion when it does not cover the equal distance in equal intervals of time.
3) A simple pendulum is an arrangement consisting of a heavy mass suspended freely by a string. I have attached an image of my drawing of a pendulum below that I drew in my school worksheet file. Motion of the pendulum - Oscillatory motion.
4)One oscillation: One oscillation is one complete to and fro motion of the pendulum about its mean position.
Time period: The time taken by the pendulum to complete one oscillation is called its time period.
Frequency: The number of oscillations made by the pendulum in one second is called its time period.
5) Speed = distance/time
= 540/4.5
= 120km/h
6)Time = diatance/speed
= 1995/19
=105 h
7) The distance traveled is 50m
8) (a) Atomic clocks
(b) Galileo Galilei
(c) sundial, hourglass, candle clock
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