A girl is pushing a box towards East direction. In which direction should her friend push the box so that it moves faster in the same direction?

2

(a)

Does the palm apply any force on the ball, when we place our palm in front of a moving ball?

2

(a)

Briefly mention the interaction of poles of two magnets.

2

(a)

While sieving grains, small pieces fall down. Which force pulls them down?

2

(a)

Briefly, describe the walking of camels on sand.

2

(a)

State whether the liquid and gases also exerts pressure.

2

(a)

Boojho wants to know how we take advantage of the knowledge that pressure can be increased or decreased by changing the area on which a force acts.

2

(a)

Boojho is confused; he thinks if the area of his head were even one hundredth of a square metre he should be carrying a weight of 1030 kg on his head. Why does such a large force not crush him?

2

(a)

What is a force?

2

(a)

What is the magnitude of the force when it acts in the opposite directions on an object?

2

(a)

What is an electrostatic force?

2

(a)

What is pressure?

2

(a)

What would be the pressure if a force of 25N is applied over an area of 100m²?

2

(a)

What are the interactions of poles of two magnets?

2

(a)

In which situation does the net force become zero?

2

(a)