what is gravity?

What is meant by gravity ?

A coolie with load on his head is walking on a horizontal platform. What is work done against gravity.

Explain what is meant by centre of gravity.

What is the difference between centre of mass and centre of gravity?

Three spring mass systems are shown in figure. Assuming gravity free spece, find the time period of oscillations in each case. What should be the answer if space is not gravity free ?

Three spring mass systems are shown in figure. Assuming gravity free spece, find the time period of oscillations in each case. What should be the answer if space is not gravity free ?

The centre of gravity

What is acceleration due to gravity? What is its average value?

What would happen if gravity suddenly disappears?