Question

which of the following cases the net force acting on the body is not zero
a. A drop of train falling down with a constant speed
b. A crock of mass 10g floating on the surface of water.
c. A car moving with a constant speed of 20km/h on a rough road.
d. A pebble of mass 0.05kg is thrown vertically upwards.

Answer 1

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a) Zero net force

The rain drop is falling with a constant speed. Hence, it acceleration is zero. As per Newton’s second law of motion, the net force acting on the rain drop is zero.

b) Zero net force

The weight of the cork is acting downward. It is balanced by the buoyant force exerted by the water in the upward direction. Hence, no net force is acting on the floating cork.

c) Zero net force

The kite is stationary in the sky, i.e., it is not moving at all. Hence, as per Newton’s first law of motion, no net force is acting on the kite. d) Zero net force

The car is moving on a rough road with a constant velocity. Hence, its acceleration is zero. As per Newton’s second law of motion, no net force is acting on the car.

e) Zero net force

The high speed electron is free from the influence of all fields. Hence, no net force is acting on the electron.

I hope, this will help you

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Answer 2

Questionwhich of the following cases the net force acting on the body is not zero
a. A drop of train falling down with a constant speed
b. A crock of mass 10g floating on the surface of water.
c. A car moving with a constant speed of 20km/h on a rough road.
d. A pebble of mass 0.05kg is thrown vertically upwards.



Answer = a