Ncert Exercises & Solutions

Question 5.1:

Give the magnitude and direction of the net force acting on

a) a drop of rain falling down with a constant speed,
b) a cork of mass 10 g floating on water,
c) a kite skilfully held stationary in the sky,
d) a car moving with a constant velocity of 30 km/h on a rough road,
e) a high-speed electron in space far from all material objects, and free of electric and magnetic fields.

a) As the drop of rain is falling with constant speed, so, acceleration will be zero.

Hence, force,F=ma=0
(b) As the cork is floating on water, its weight is being balanced by the upthrust (equal to.weight of water displaced). Hence net force on the cork is zero.
(c) Net force on a kite skilfully held stationary in the sky is zero because it is at rest.
(d) Since the car is moving with a constant velocity, the net force on the car is zero.
(e) Since the electron is far away from all material agencies producing electromagnetic and gravitational forces, the net force on the electron is zero.

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