ANVEKSHA:3

Motion

NCERT Solution

Solution of In Text Questions - 1

Question : 1 - An object has moved through a distance. Can it have zero displacement? If yes, support your answer with an example.

Answer:-

Yes, zero displacement is possible if an object has moved through a distance.

Suppose a ball starts moving from point A and it returns back at same point A, then the distance will be equal to 20 meters while displacement will be zero.

Question : 2 - A farmer moves along the boundary of a square field of side 10 m in 40 s. What will be the magnitude of displacement of the farmer at the end of 2 minutes 20 seconds from his initial position?

Answer:-

Given, side of the square field = 10m

Therefore, perimeter = 10 m x 4 = 40 m

Farmer moves along the boundary in 40s.

Displacement after 2 m 20 s = 2 x 60 s + 20 s = 140 s =?

Since in 40 s farmer moves 40 m

Question : 3 - Which of the following is true for displacement?

(a) It cannot be zero.

(b) Its magnitude is greater than the distance travelled by the object.

Answer: None

Question : 4 - Distinguish between speed and velocity.

Answer:

Speed has only magnitude while velocity has both magnitude and direction.

Question : 5 - Under what condition(s) is the magnitude of average velocity of an object equal to its average speed?

Answer: The magnitude of average velocity of an object will be equal to its average speed in the condition of uniform velocity.

Question : 6 - What does the odometer of an automobile measure?

Answer: In automobiles, odometer is used to measure the distance.

Question : 7 - What does the path of an object look like when it is in uniform motion?

Answer: In the case of uniform motion the path of an object will look like a straight line.