1Does the acceleration due to gravity vary according to the mass of the falling object?
2A sheet of paper is torn into two equal parts and one part is squeezed into a ball. The flat sheet, the paper ball and a small stone are dropped together. Do they fall at different velocities?
3If the paper sheet, paper ball and stone were dropped together on the Moon, what would be the result?
4What is the force of gravity? What other name is it given?
5Why is the Earth said to have a definite gravitational field?
6Write any four effects of the Earth's gravity that we see in daily life.
7Define acceleration due to gravity. Give its symbol, its SI unit and its value near the Earth's surface.
8Why does the velocity of a stone keep increasing as it falls?
9A stone is released from rest from a height of 19.6 m and takes 2 s to reach the ground. Find its acceleration and its velocity just before it hits the ground.
10When measuring g with a falling stone, why must the stone be released rather than thrown downwards?
11What did Aristotle believe about falling objects, and how did Galileo disprove it?
12Describe the feather and coin experiment. Why does the feather fall more slowly when there is air in the cylinder?