00:02
So for part a, we're going to say that the force normal is going to be equaling the mass times the acceleration due to gravity on earth.
00:08
However, now we have a weight of the truck, but we have two drive wheels.
00:14
So when we calculate, when we substitute in for the mass, we are not saying 1 .00 times 10 to the third kilograms.
00:21
We are actually plugging in 0 .5 because we have two wheels.
00:26
So 0 .5 times 10 to the third kilograms.
00:30
Multiply by 9 .8 meters per second squared, this is equaling 4 .9 times 10 to the third neutens.
00:39
And at this point, we can say that the force of friction kinetic, or more commonly used, you can say lowercase f is always, lowercase f has always denotes the force of friction.
00:53
So force of friction kinetic would be equaling the coefficient of kinetic friction times the force normal.
00:59
And so we can say that this would be 0 .7 multiplied by 4 .9 times 10 to the third neutins.
01:09
You can find the coefficient of friction between the wheels and the concrete, the dry concrete in table 5 .1...