The harder you hit the brakes while driving forward, the more the front end of your car will move down and the rear end move up. Why? What happens when, accelerating

What type of waves are illustrated by the movement of a rope whose one end is fixed to a pole and the other end is moved up and down?

What happen when you rub your hands vigorously for a few seconds ? Why does this happen ?

(a) When a molecule (or an elastic ball) hits a (massive) wall, it rebounds with the same speed. When a ball hits a massive bat held firmly, the same thing happens However, when the bat is moving towards the ball, the ball rebounds with a different speed. Does the ball move faster or slower? (b) When gas in a cylinder is compressed by pushing in a piston. Its temperature rises. Guess at an explanation of this in terms of kinetic theory using (a) above (c) What happens when a compressed gas pushes a piston out and expands. What would you observe? (d) Sachin Tendulkar uses a heavy cricket bat while playing. Does it help him in any way?

A person driving a car suddenly applies the brakes on seeing a child on the road ahead . If he is not wearing seat belt, he falls forward and hits his head against the steering weel. Why ?

A mass of 10 kg is suspended from a string, the other end of which is held in hand Find the tension in string when the hand is moved up with a uniform acceleration of 2ms^(-1) . Given g = 10 ms^(-1) .

When brakes are applied on a moving car, the car dips to the front. Why ? [That is try to show that front wheels are more pressed as compared to rear ones when the brakes are applied]. Assume that centre of mass of the car is equidistant from the front and rear wheels.