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Motion In Straight Line

Question

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Any two bodies on the surface of the earth should move towards each other due to force of attraction acting between them but they do not. Why?

Solution

The masses of the bodies are very small as compared to the mass of the earth.
Hence, the force of attraction between the two bodies is very small as compared to the force of friction between the bodies and the surface of the earth.
Hence, they do not move towards each other.

Some More Questions From Motion in Straight Line Chapter

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.

Define distance.

Define displacement.

Can magnitude of displacement be greater than distance travelled by particle?

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