When a football player kicks a ball, he experiences a force on his leg which is equal to the force he exerted on the ball.
When a footballer kicks a ball, the ball moves in the direction of applied force. The footballer also experiences a force on his leg which is equal to the force he exerted on the ball.
In the following example, try to identify the number of times the velocity of the ball changes:
“A football player kicks a football to another player of his team who kicks the football towards the goal. The goalkeeper of the opposite team collects the football and kicks it towards a player of his own team”.
Also identify the agent supplying the force in each case.