Gravitation

Topics in this chapter

• Universal Law of Gravitation
• Gravity and Free Fall
• Mass, Weight and Weightlessness
• Gravity in Orbits and Space
• Buoyancy and Archimedes Principle
• Density, Pressure and Floating

Cheat sheet

Practice questions

1. Question 1Q-A1FF9C

   What happens to the gravitational force between two objects if the distance between them is halved?

   1. A.It is halved
   2. B.It is doubled
   3. C.It increases by a factor of 4
   4. D.It decreases by a factor of 4
   See the answer and solution
2. Question 2Q-D57742

   An object is thrown vertically upwards with an initial velocity $u$. What is its acceleration at the highest point of its motion?

   1. A.Zero
   2. B.Equal to acceleration due to gravity ($g$) downwards
   3. C.Equal to $-u$ upwards
   4. D.Maximum
   See the answer and solution
3. Question 3Q-A13BC7

   Why does a sheet of paper fall slower than one crumpled into a ball in air?

   See the answer and solution
4. Question 4Q-65F821

   If the mass of both objects interacting gravitationally is doubled while keeping the distance between them constant, the gravitational force between them will:

   1. A.remain the same
   2. B.double
   3. C.quadruple
   4. D.be halved
   See the answer and solution
5. Question 5Q-12585C

   State the Universal Law of Gravitation in words.

   See the answer and solution