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Suppose You Are Running Fast in a Field and Suddenly Find a Snake in Front of You. You Stop Quickly. Which Force is Responsible for Your Deceleration?

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प्रश्न

Suppose you are running fast in a field and suddenly find a snake in front of you. You stop quickly. Which force is responsible for your deceleration?

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उत्तर

The force of friction acting between my feet and ground is responsible for my deceleration.

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पाठ 5: Newton's Laws of Motion - short answers [पृष्ठ ७७]

APPEARS IN

एचसी वर्मा Concepts of Physics Volume 1 and 2 [English]
पाठ 5 Newton's Laws of Motion
short answers | Q 10 | पृष्ठ ७७

संबंधित प्रश्‍न

A body of mass 0.40 kg moving initially with a constant speed of 10 m s–1 to the north is subject to a constant force of 8.0 N directed towards the south for 30 s. Take the instant the force is applied to be t = 0, the position of the body at that time to be x = 0, and predict its position at t = –5 s, 25 s, 100 s.


The below figure shows the position-time graph of a particle of mass 4 kg.

  1. What is the force on the particle for t < 0, t > 4 s, 0 < t < 4 s?
  2. What is the impulse at t = 0 and t = 4 s? (Consider one-dimensional motion only.)


A free 238U nucleus kept in a train emits an alpha particle. When the train is stationary, a nucleus decays and a passenger measures that the separation between the alpha particle and the recoiling nucleus becomes x at time t after the decay. If the decay takes place while the train is moving at a uniform velocity v, the distance between the alpha particle and the recoiling nucleus at a time t after the decay, as measured by the passenger, is


Two blocks of equal mass m are tied to each other through a light string. One of the blocks is pulled along the line joining them with a constant force F. Find the tension in the string joining the blocks.


Two blocks A and B of mass mA and mB , respectively, are kept in contact on a frictionless table. The experimenter pushes block A from behind, so that the blocks accelerate. If block A exerts force F on block B, what is the force exerted by the experimenter on block A?


Let m1 = 1 kg, m2 = 2 kg and m3 = 3 kg in the following figure. Find the accelerations of m1, m2 and m3. The string from the upper pulley to m1 is 20 cm when the system is released from rest. How long will it take before m1 strikes the pulley?


A monkey of mass 15 kg is climbing a rope fixed to a ceiling. If it wishes to go up with an acceleration of 1 m/s2, how much force should it apply on the rope? If the rope is 5 m long and the monkey starts from rest, how much time will it take to reach the ceiling?


The monkey B, shown in the following figure, is holding on to the tail of monkey A that is climbing up a rope. The masses of monkeys A and B are 5 kg and 2 kg, respectively. If A can tolerate a tension of 30 N in its tail, what force should it apply on the rope in order to carry monkey B with it? Take g = 10 m/s2.


In the following figure shows a man of mass 60 kg standing on a light weighing machine kept in a box of mass 30 kg. The box is hanging from a pulley fixed to the ceiling by a light rope, the other end of which is held by the man himself. If the man manages to keep the box at rest, what is the weight recorded on the machine? What force should he exert on the rope to record his correct weight on the machine?


Two balls A and B of masses m and 2 m are in motion with velocities 2v and v, respectively. Compare:

(i) Their inertia.

(ii) Their momentum.

(iii)  The force needed to stop them in the same time.


State Newton's second law of motion. Under what condition does it take the form F = ma?


How long will a stone take to fall to the ground from the top of a building 80 m high 


An electron of mass 9 × 10−31 kg is moving with a linear velocity of 6 × 107 ms−1. Calculate the linear momentum of electron.


What do you understand by the term momentum?


What do you mean by linear momentum of a body?


A ball is thrown upward and reaches a maximum height of 19.6 m. Find its initial speed?


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?


The INCORRECT statement about Newton's second law of motion is


Figure shows (x, t), (y, t ) diagram of a particle moving in 2-dimensions.


(a)


(b)

If the particle has a mass of 500 g, find the force (direction and magnitude) acting on the particle.


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