00:01
So i certainly like this next question.
00:03
It speaks about something very true in newton's laws when we really look at some quantities like coefficients of friction.
00:12
We don't always get an intuitive sense for what they mean.
00:15
This goes a long way to sort of making things feel a bit more intuitive.
00:19
And so i'm going to love this sort of question.
00:22
And it's all about you're hired to devise a method to determine the coefficient of friction between the ground and the soles of a shoe and of its competitive.
00:30
So explain your experimental technique and provide the physical analysis that can be used by others.
00:36
Let's just get down to the physics of the situation.
00:39
This is really what this question wants us to solve.
00:43
And i suggest that what we're going to do is we're going to take a slope.
00:47
And we're going to set this at a variable theta.
00:51
And we'll stick our shoe on the slope and of course we get a rise of some forces.
00:57
There's no external forces, no ropes attached or anything like that.
01:00
We simply have the normal force.
01:01
The weight of the shoe, mg, and of course a coefficient of static friction, which is going to emerge from the force of friction, which prevents us from just sliding down the slope.
01:16
And from this we can just stick the angle theta also here, and let's resolve some forces...