State any two illustrations for Newton's third law of motion
Answers
Answer:
Solves Examples on Newtons Laws.
Q1. Give the magnitude and direction of the net force acting on:
A drop of rain falling down at a constant speed,
A cork of mass 10 g floating on water,
Kite skilfully held stationary in the sky,
Car moving with a constant velocity of 30 km/h on a rough road,
A high-speed electron in space far from all material objects, and free of electric and magnetic fields.
Solution:
Since the raindrop is falling at a constant speed, its acceleration is zero. Hence, according to Newton’s Second Law, the net force acting on the raindrop is zero.
The weight of the cork is acting in the downward direction and the buoyant force of the water is exerted in the upward direction. Hence, the net force is zero.
Since the kit is stationary in the sky, Newton’s First Law implies that no net external force is acting on the kite.
Since the velocity of the car is constant, there is no acceleration of the car. Hence, as per Newton’s Second Law, the net force acting on the car is zero.
Since the high-speed electron is free from all fields, the net force acting on it is zero.