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.

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Solution

The velocity of the ball changes four times.

As a football player kicks the football, its speed changes from zero to a certain value. As a result, the velocity of the ball gets changed. In this case, the player applied a force to change the velocity of the ball. Another player kicks the ball towards the goal post. As a result, the direction of the ball gets changed. Therefore, its velocity also changes. In this case, the player applied a force to change the velocity of the ball. The goalkeeper collects the ball. In other words, the ball comes to rest. Thus, its speed reduces to zero from a certain value. The velocity of the ball has changed. In this case, the goalkeeper applied an opposite force to stop/change the velocity of the ball. The goalkeeper kicks the ball towards his team players. Hence, the speed of the ball increases from zero to a certain value. Hence, its velocity changes once again. In this case, the goalkeeper applied a force to change the velocity of the ball.

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Q. Question 2
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.

In the following example, try to identify the number of times the velocity of 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.'

Q. Answer the following questions:

1) 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 kicked 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.

2) Explain why some of the leaves may get detached from a tree if we vigorously shake its branch.

3) Why do you fall in the forward direction when a moving bus brakes to a stop and fall backwards when it accelerates from rest?

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In a game of football, if a player kicks the ball into opponent's goal post then he scores a goal. If he passes the ball to any of his team mates and that particular team mate scores a goal after that, the player is said to have assisted the goal. Here you have line graphs which give the goals and assists of two players in past 5 months. The player who played better in Month 5 is ________. (Assume the level of competition in the matches played by both the players was same)

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