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Motion in Straight Line
Question
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If a body weighs 100N at the surface of the earth, how much will it weigh at the centre of the earth?

Answer

As the body is moved closer to the center of the earth, the mass of the earth between the center of the earth and the body keeps decreasing.
This causes the force acting from the center of the earth on the body to decrease.
Hence, the weight of the body at the centre of the earth = zero.

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Some More Questions From Motion in Straight Line Chapter

What is motion?

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?