Question

A 1.00 kg soccer ball is kicked down field at 5 m/s by a Bob on...

A 1.00 kg soccer ball is kicked down field at 5 m/s by a Bob on Team A. Tom, a member of Team B, runs up and kicks the ball so that it is traveling at 15 m/s in the opposite direction. Toms' foor is in contact with the ball for 0.50 seconds.


A. what is the initial momentum of the ball and its direction?

B. what is the final momentum of the ball and its direction?

C. what is the impulse acting on the ball?

D. with what force does tom kick the ball?


Please show work!


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Homework Answers

Answer #1

(a) what is the initial momentum of the ball and its direction?
Pi = m*Vi = 1kg*5m/s = 5kgm/s down the field
(b) what is the final momentum of the ball and its direction?
1kg*15m/s = 15kgm/s up the field
(c) what is the impulse acting on the ball?
Impulse equal change in momentum = 5 - (-15) = 20kgm/s = F*t
If "down the field" is positive then "up the field" is negative.
(d) with what force does Sammy kick the ball?
=> F = 20/0.5 = 40N

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