A brave but inadequate rugby player is being pushed backward by an opposing play
ID: 1883298 • Letter: A
Question
A brave but inadequate rugby player is being pushed backward by an opposing player who is exerting a force of 800.0 N on him. The mass of the losing player plus equipment is 95.0 kg, and he is accelerating at 1.18 m/s2 backward. (Enter the magnitudes.)
(a) What is the force of friction (in N) between the losing player's feet and the grass?
_? N
(b) What force (in N) does the winning player exert horizontally on the ground to move forward if his mass plus equipment is 111.0 kg? (Assume the winning player is accelerating with the losing player at 1.18 m/s2.)
_? N
Explanation / Answer
(a)
net Force acting on the losing rugby player is
Fnet = F - f
m*a = F -f
95*1.18 = 800 - f
f = 687.9 N
the force of friction between the losing player's feet and the grass is 687.9 N.
(b)
net Force acting on the winning rugby player is
Fnet = f - F
111*1.18 = f - 800
f = 930.98 N
the force of friction between the winning player's feet and the grass is 930.98 N.
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