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Motion in Straight Line
Question
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A particle completes one revolution in 6 seconds along the circumference of radius 20cm. What is the total length of the path travelled by the particle in 15 seconds and displacement in 15 seconds?

Answer

Given,  

Time taken by the particle to complete 1 revolution = 6 s 

Radius of the circle = 20 cm 

No. of revolutions made in 15 seconds = 2.5 revolution

After 2.5 revolutions, the particle will be at the point diagonally opposite to the starting point. 

So, Displacement of particle = 2r = 40 cm

Distance travelled by the particle = Total length of the particle. 

Distance = total length of the path = 2.5x2πr = 100 π cm 

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Some More Questions From Motion in Straight Line Chapter

Is absolute rest or absolute motion possible?

What is the most essential thing to study the motion of a body?

Can a body be always at rest in some frame?

Can a body be in motion in the frame associated with the body itself?

When an object in motion can be considered as particle or point object?

Can you think of physical phenomena involving the moon in which moon cannot be treated as particle?

A train is crossing the bridge. Can it be taken as a particle?

Can a train be taken a particle? Give an example in support of your answer.

 A particle is moving along curved line in space. Is the motion one dimensional?

State which of the following are examples of one, two or three dimensional motion: 

(a) A kite flying in the sky.

(b) The earth revolving around the sun. 

(c) A train moving along the equator of the earth in clockwise direction. 

(d) Accelerated motion of a particle in a straight line.