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You Are Travelling in a Car. the Driver Suddenly Applies the Brakes and You Are Pushed Forward. Why Does this Happen? - Physics

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प्रश्न

You are travelling in a car. The driver suddenly applies the brakes and you are pushed forward. Why does this happen?

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उत्तर

We are pushed forward because of the inertia of motion, as our body opposes the sudden change.

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पाठ 5: Newton's Laws of Motion - short answers [पृष्ठ ७६]

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एचसी वर्मा Concepts of Physics Vol. 1 [English] Class 11 and 12
पाठ 5 Newton's Laws of Motion
short answers | Q 5 | पृष्ठ ७६

संबंधित प्रश्‍न

Two masses 8 kg and 12 kg are connected at the two ends of a light, inextensible string that goes over a frictionless pulley. Find the acceleration of the masses, and the tension in the string when the masses are released.


A batsman deflects a ball by an angle of 45° without changing its initial speed which is equal to 54 km/h. What is the impulse imparted to the ball? (Mass of the ball is 0.15 kg.)


An aircraft executes a horizontal loop at a speed of 720 km/h with its wings banked at 15°. What is the radius of the loop?


A block of mass 15 kg is placed on a long trolley. The coefficient of static friction between the block and the trolley is 0.18. The trolley accelerates from rest with 0.5 ms–2 for 20 s and then moves with uniform velocity. Discuss the motion of the block as viewed by (a) a stationary observer on the ground, (b) an observer moving with the trolley.


The rear side of a truck is open and a box of 40 kg mass is placed 5 m away from the open end as shown in Figure. The coefficient of friction between the box and the surface below it is 0.15. On a straight road, the truck starts from rest and accelerates with 2 m s–2. At what distance from the starting point does the box fall off the truck? (Ignore the size of the box).


A person drops a coin. Describe the path of the coin as seen by the person if he is in

  1. a car moving at constant velocity and
  2. in a free falling elevator.

A spy jumps from an airplane with his parachute. The spy accelerates downward for some time when the parachute opens. The acceleration is suddenly checked and the spy slowly falls to the ground. Explain the action of the parachute in checking the acceleration.


A person says that he measured the acceleration of a particle to be non-zero even though no force was acting on the particle.


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A man has fallen into a ditch of width d and two of his friends are slowly pulling him out using a light rope and two fixed pulleys as shown in the following figure. Show that the force (assumed equal for both the friends) exerted by each friend on the road increases as the man moves up. Find the force when the man is at a depth h.


Find the reading of the spring balance shown in the following figure. The elevator is going up with an acceleration g/10, the pulley and the string are light and the pulley is smooth.


Find the acceleration of the blocks A and B in the three situations shown in the following figure.


Two bodies A and B of same mass are moving with velocities v and 2v, respectively. Compare their (i) inertia and (ii) momentum.


State the Newton's second law of motion. What information do you get from it?


Write the mathematical form of Newton's second law of motion. State the conditions if any.


The unit of linear momentum is :


The linear momentum of a ball of mass 50 g is 0.5 kg m s-1. Find its velocity.


State two factors which determine the momentum of a body.


Use Newton's second law to explain the following:
While catching a fast moving ball, we always pull our hands backwards.


A stone is dropped from a tower 98 m high. With what speed should a second stone be thrown 1 s later so that both hit the ground at the same time?


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