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Selina Solutions Class 9 Physics Solutions for Exercise 3D in Chapter 3 - Chapter 3 Laws Of Motion

Question 4 Exercise 3D

Name and state the action and reaction in the following cases:

(a) Firing a bullet from a gun,

(b) Hammering a nail,

(c) A book lying on a table,

(d) A moving rocket,

(e) A person walking on the floor,

(f) A moving train colliding with a stationary train

Answer:

The names and action, reactions in each of the cases are as follows:

Cases Action Reaction
Firing a bullet from a gun Force exerted on the bullet Gun experiences an equal recoil
Hammering a nail Force exerted on the nail by the hammer Force exerted by the nail on the hammer
A book lying on a table Force exerted by the book on the table Force experienced by the book from the table in the upwards direction
A moving rocket Force exerted by the rocket backwards on the gases Force exerted by the gases on the rocket causing it to propel forward
A person walking on the floor Force exerted by the person’s feet in backward direction on the ground Force experienced by the ground on the person’s feet in the forward direction
A moving train colliding with a stationary train Force applied by a moving train on a train at rest Force experienced by the train at rest on a moving train

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