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.
Q. 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.
Ans. The velocity of the football changes four times : First time, the velocity changes when the player applies force to kick the ball towards another player of his team.
Second time, the velocity changes when the other player kicks the ball towards the goal.
Third time, the velocity changes when the goalkeeper collects the ball by applying force in a direction opposite to the direction of the motion of the ball.
Fourth time, the velocity changes when the goalkeeper kicks the ball towards the player of his own team by applying force.
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