00:02
The car with a mass of 1500 kilograms is on an unbanked curve.
00:09
That unbanked means flat.
00:11
And it has a radius of 52 meters and the car is moving at a speed of 12 meters per second.
00:17
And we want to know what is the coefficient of friction between the tires and the road to keep the car from slipping.
00:25
And we're told gravity is 9 .8 meters per second squared.
00:29
All right.
00:29
So this car is going around a curve.
00:32
So it has a centripetal force.
00:35
And that centripetal force for unbanked curves is our force of friction.
00:40
So the equation for centripetal force is mass velocity squared divided by radius.
00:46
Now frictional force is what we need to solve for.
00:49
So we're going to use that equation coefficient of friction is equal to force of friction divided by normal force.
00:55
Multiply both sides by normal force and we get force of friction is equal to coefficient of friction times normal force.
01:02
Well, we don't know normal force, but if we were to do a free body diagram, we see force of gravity is going down...