SI unit of length is .
Important Questions on Motion and Measurement of Distances
Write one example for rectilinear motion.
Write one example for circular motion.
Write one example for periodic motion.
Write one example for circular and periodic motion.
The photograph given in the figure above shows a section of a grille made up of straight and curved iron bars. How would you measure the length of the bars of this section, so that the payment could be made to the contractor?
Identify the different types of motion in the following word diagram.
| Y | O | U | N | G | C | C | N | T | E | R |
| L | E | V | E | L | P | I | E | E | A | R |
| A | L | L | O | T | O | P | P | E | A | I |
| N | O | T | E | P | A | D | N | E | C | K |
| O | W | O | N | E | W | I | Y | Z | S | E |
| I | E | V | O | R | L | O | A | D | W | P |
| T | R | G | N | I | C | E | D | R | I | L |
| A | Z | H | T | O | N | G | U | E | N | A |
| T | X | C | R | D | E | P | T | H | G | R |
| O | E | Y | C | I | R | C | U | L | A | R |
| R | T | L | C | C | O | P | P | E | R | T |
Four children measure the length of a table which was about . Each of them used different ways to measure it.
(i) Sam measured it with a half metre long thread.
(ii) Gurmeet measured it with a scale from her geometry box.
(iii) Reena measured it using her hand span.
(Iv) Salim measured it using a long measuring tape.
Which one of them would get the most accurate length? Give reasons for your answer.
Match the events related to motion in Column I with the types of motions given in Column II.
| Column I | Column II |
| (a) A moving wheel of a sewing machine | (i) Circular motion |
| (b) Movement of the tip of the minute hand of a clock in one hour | (ii) Rotational motion |
| (c) A moving swing | (iii) Periodic motion |
