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Gravitation

Why is it difficult to hold a school bag having a strap made of a thin and strong string?

10/11/2024

Science

9th

Gravitation

Why is the weight of an object on the moon 1/6th its weight on the earth?

10/11/2024

Science

9th

Gravitation

What are the differences between
the mass of an object and its weight?

10/11/2024

Science

9th

Gravitation

What do you mean by acceleration due to gravity?

10/11/2024

Science

9th

Gravitation

What do you mean by free fall?

10/11/2024

Science

9th

Gravitation

Write the formula to find the
magnitude of the gravitational
force between the earth and an
object on the surface of the earth.

10/11/2024

Science

9th

Gravitation

State the universal law of
gravitation.

10/11/2024

Science

9th

Force and laws of motion

A motorcar of mass 1200 kg is moving along a straight line with a uniform velocity of 90 km/h. Its velocity is slowed down to 18 km/h in 4 s by an unbalanced external force. Calculate the acceleration and change in momentum. Also calculate the magnitude of the force required.

10/11/2024

Science

9th

Force and laws of motion

A hammer of mass 500 g, moving at 50 m s-1, strikes a nail. The nail stops the hammer in a very short time of 0.01 s. What is the force of the nail on the hammer?

10/11/2024

Science

9th

Force and laws of motion

Two persons manage to push a motorcar of mass 1200 kg at a uniform velocity along a level road. The same motorcar can be pushed by three persons to produce an acceleration of 0.2 m s-2. With what force does each person push the motorcar? (Assume that all persons push the motorcar with the same muscular effort.)

10/11/2024

Science

9th