00:01
All right, we have a football player pushing our sled that is 60 kilograms.
00:07
I'll put m there.
00:10
Our mass for the sled, 60 kilograms.
00:15
The coefficient of kinetic friction, our mu sub k, is 0 .3.
00:24
And we want to know the football players moving this at a constant speed.
00:30
And we want to know how much does the football player need to push it so it moves.
00:36
All right, well, the force applied by the football player put foot and minus the coefficient of friction, right, is going to give us the total force.
00:59
We have the normal force multiplied times mu k, our coefficient of kinetic friction, is that f.
01:10
So let's go ahead and fill that in.
01:13
Our mu subk is 0 .3...