Laws of Motion ...

While dusting a carpet, we give it a sudden jerk or beat it with a stick because: 

A pushing force acts on the trolley as shown. Which arrow shows the frictional force acting on the wheel X?

A cricket ball of mass 500 g is moving with speed of $$36 \,km\,h^{-1}$$. It is reflected back with the same speed. What is the impulse applied on it?

A cricket ball of mass 120 g is moving with a velocity of 12 m $$s^{-1}$$. It turns back and moves with a velocity of 20 m $$s^{-1}$$ when hit by a bat. Find the impulse if the force acts on the ball for 0.02 s.

A $$1\ m$$ long uniform beam is balanced as shown. Calculate the force F.

Momentum is a measure of quantity of _______.

A hammer of mass 5 kg moving with a speed of $$2ms^{−1}$$ strikes the head of a nail driving it 20 cm into the wall. Find the impulse(in N s).

When a body is stationary, then:

The time, in which a force of 2 N produces a change in momentum of $$0.4\, kg\, m\, s^{-1}$$ in a body whose mass is 1 kg is: 

The impulse of a body is equal to: