Question

Pick the cases where Newton's third law of motion is involved.

• A. Recoil of a gun while firing
• B. Swimming in a pool
• C. A space shuttle being launched
• D. All of the above

Answer 1

The correct option is D All of the above

For all the cases mentioned in the options, a pair of action and reaction forces are acting on the system.
Option (a) : While swimming, hands push the water backwards and the reaction force by water propells the swimmer forward.
Option (b) : The burning fuel of the shuttle applies the force in the downward direction and the reaction force from the ground propells the shuttle upwards.
Option (c) : While firing a bullet from gun, the gun applies force on the bullet in the forward direction and the bullet applies the reaction force on the gun which we feel as the recoil.
Hence, option d is correct.