Question

G. Give reasons for the following
1. Why does the wall not move even though we exert force on it?
2. Why is gravitational force always considered to be a 'pull' force?
3. Why does a rolling ball stop after moving a certain distance?
4. Why does a car skid on wet road?
5. Why is it easier to pull luggage with wheels?​

Answer 1

Answer:

1. The wall's mass is great enough to bear the force you put on it so it doesn't move
2. Gravity 'pulls' because it gets the object towards it source. 'pushing' would be applying force to make it move away from the source.
3. The ball is stopped by friction acting on it. As long as the force is enough to overcome the friction it moves but stops when it can't overcome the friction.
4. The wet floor has lesser friction on it as it gets lubricated. The tire doesn't have a proper grip so it skids
5. Wheels help overcome friction as they roll rather than be in proper contact the whole time.