A football player kicks football to another player who kicks it toward goal. The goalkeeper of opposite team collects the football and kicks it towards a player of his own team. The momentum of football changes :
a) two times b) three times
c) one time d) four times
Answers
Answer:
Four times
Explanation:
(i) Velocity of the football changes when first player kicks the ball towards another player of his team.
(ii) Velocity of the football also changes when another player kicks the football towards the goal.
(iii) Velocity of the football also changes when the goalkeeper of the opposite team stops the football by collecting it.
(iv) Velocity of the football changes when the goalkeeper kicks it towards a player of his team.
Thus, the velocity of the ball changes four times in this case.
In first and second cases, the force is supplied by the foot of players. In third case, force is supplied by the hands of the goalkeeper. In fourth case, as the goalkeeper hits the football with his foot, so the foot of the goalkeeper supplies the force.
Answer:
d) four times
Explanation:
The velocity of football changes four times. First, when a football player kicks to another player, second when that player kicks the football to the goalkeeper. Third when the goalkeeper stops the football. Fourth when the goalkeeper kicks the football towards a player of his own team.
Agent supplying the force
First case – First player
Second case – Second player
Third case – Goalkeeper
Fourth case – Goalkeeper