1. Is there any force applied when
(i) you push the wall of a house?
(ii) the speed of the cycle is increased?
(iii) the player changes the direction of football by using his head?

2. What is the property by virtue of which a body tends to remain stationary?

3. When a bus suddenly starts, the passengers feel a backward jerk. Why?

4. If forces of same magnitude are applied on two bodies of masses 2 kg and 4 kg, which of the bodies will have more acceleration?

5. If a body of mass 5 kg moves with a velocity of 10 ms^-1, then what is the momentum of the body?

6. If a force of 10N produces an acceleration of 2 ms^-2 in a body, how much force would be required to produce an acceleration of 4 ms^-1 in the same body?

7. What is the acceleration of an aeroplane moving in a circle around the Earth, if the passenger in it feels weightlessness?

8. Does any force act on a body in a free fall.

9. Density of kerosene is 0.8 g cm-3 and density of water is 1 g cm-3. Which one will exert greater buoyant force on a body?

10. A body is immersed in a liquid. If the liquid displaced by the body weighs 20g then what is the buoyant force acting on the body?

11. If the weight of a body is 10 g and the buoyant force is 7g, will the body sink or float?

12. Why is straw used to drink a soft drink?

13. Sailors generally say that a person is easily drowned in a river than in sea, why?