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While standing still on a basketball court, you throw the ball to a teammate. Why do you not move backward as a result? Is the law of conservation of momentum violated?
Answer: The law of conservation of momentum is not violated.
When you stand on a basketball court and push the ball to the left, the ball will push you back according to Newton’s third law.
When the ball pushes you back, your foot will push the ground to the right, as shown in the figure above.
The ground pushes back on your foot and that makes you stable.
This is what we call Static friction force.
So that the momentum is not violated and still conserved:
That Force is opposed by the friction force by the same amount so that you will be stationary.
So we can write the last equation as follows: