A ball falls straight down through the air to the earth\'s surface. If such a ba

Question

A ball falls straight down through the air to the earth's surface. If such a ball can fall for a long enough time, the force of air resistance (which increases as the speed of the ball increase) will eventually build up to equal the force of gravity in magnitude, so that the ball falls with constant velocity.

Consider such a situation; the force of gravity the earth exerts on the ball is 15N, the force of air resistance on the ball is 15N, and the force of gravity the ball exerts on the earth is 15N.

Which of the forces of the same magnitude but different directions form a "third law pair" in the sense F12 = -F21?

1. The force of gravity on the ball and the force of air resistance on the ball

2. The force of gravity on the ball and force of gravity on the earth

3. The force of air resistance on the ball and the force of gravity on the earth

4. None of these forces form a "thied law pair," since they have nothing whatsoever to do with one another physically.

Explanation / Answer

2. The force of gravity on the ball and force of gravity on the earth

For every action there is equal and opposite reaction pair is the gravitational force the earth exerts on ball and the gravitational force the ball exerts on earth

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