The photograph given as Fig. 10.7 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?

Fill in the blanks

(i) Motion of an object or a part of it around a fixed point is known as ................ motion.

(ii) A body repeating its motion after certain interval of time is in ........... motion.

(iii) In rectilinear motion, object moves........... a ............ line.

(iv) SI unit of length is ............

Write one example for each of the following type of motion.

(i) Rectilinear

(ii) Circular

(iii) Periodic

(iv) Circular and periodic

Identify the different types of motion in the following word diagram given as Fig. 10.8.

Four children measure the length of a table which was about 2 m. 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 15 cm scale from her geometry box.

(iii) Reena measured it using her hand span.

(iv) Salim measured it using a 5 m long measuring tape.

Which one of them would get the most accurate length? Give reason for your answer.