Question

1. Which of these is an application of Newton's second law of motion? 


(a) we fall in the forward direction when brakes are applied in a car

(b) karate player is able to break pile of tiles with one blow.

(c) rcoil of gun

(d) none of these

2. Which of these is an example of uniformly accelerated motion? 


(a) an athlete running on a circular track

(a) a stone thrown in the air

(a) a man walking on road

(a) a car on a busy road

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Answer 1

Answer:

1. (b) karate player.....

2. (b) a stone thrown........

Answer 2

Answer:

1) (b)

2 (b)

Explanation:

1) The rate of change in momentum of a. body is directly proportional to the applied unbalanced force. (2nd law)

When karate player strikes the pile of tiles (at rest), at that moment, momentum of pile of tiles is zero., but suddenly it gains a large momentum due to strike of player.

The striker hits at a very large force and hence it got divided in parts.

2) due to gravitational force increasing at every second..

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