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Motion In Straight Line

Question

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We cannot move even a finger without disturbing all the stars. Explain.

Solution

According to Newton's law of gravitation, the force of attraction between any two bodies in this universe is inversely proportional to the square of the distance between them.
Therefore, when the finger is moved, the distance between finger and stars changes. Hence, the force of attraction between finger and stars changes. This disturbs all the stars.

Some More Questions From Motion in Straight Line Chapter

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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