Question

Distinguish between uniform and non- uniform motion, giving an example of each.
In a long distance race , the athlete was expected to take four rounds of the track
such that the line of finish was same as the line of start. What type of motion is it ?
Give reason also.

Answer 1

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$\huge\rm\underline\purple{Question :-}$

In a long-distance race, the athletics were expected to take four rounds of the track such

that the line of finish was same as the line of start. Suppose the length of the track was

200m.

(a) What is the total distance to be covered by the athletics?

(b) What is the displacement of the athletics when they touch the finish line?

(c) Is the motion of the athletics uniform or non-uniform?

(d) Is the displacement of an athletic and the distance covered by him at the end of the race equal?

$\bigstar{\underline{\underline{{\sf\ \red{ ANSWER:-}}}}}$

when finish line is same as that of initial line , it means length of one round =

2 × Length of track = 2 × 200 = 400 m

(a) total distance covered by athletics =

4 × Length of one round

= 4 × 400 = 1600 m = 1.6 Km = 1 mile

(b) displacement covered by athletics = final position - inital position =0

{ we know, accroding to question one round equal final position is same as initial position so, displacement in one round = 0 hence, displacement in 4 rounds = 0}

(C) we probably say that motion of athletic is non - uniform motion

becoz in question , never include about athletic speed , { e.g constant or not }

but practically athletic moves non - uniform motion , becoz sometime he accelerates own motion , sometimes do slow .

(d) never !!!

because , displacement = 0

but distance = 1600m = 1.6 km

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