00:01
In this question, we can see a person standing with the help of crutches.
00:04
We have been told that half of the person weight is supported by the crutches and the other half is supported by the person's feet.
00:13
So in this question, we need to find out the smallest possible coefficient of friction between the crutches and the ground.
00:19
And we also need to find out the magnitude of the compression force supported by each crutch.
00:27
So first of all, we'll try to draw a free body diagram.
00:30
So we know that a force will call this force f1 on the crash one will act upwards in this direction and a force f2 will act in this direction.
00:47
The weight of the person will act vertically downwards and a normal force from the person feeds will act upward.
00:57
We'll call this capital n.
01:00
So we are going to simplify this into our diagram.
01:04
So this is a diagram.
01:07
As you can see, the upward force is normal.
01:12
The downward force is weight and these force are f1 and sorry, f2 and f1.
01:25
So the angle between the forces is going to be theta in both cases.
01:34
And we know the theta is 20.
01:37
So we'll try to find out the value of f1 and f2.
01:43
So we know that theta is 20.
01:47
We will submission of all the vertical forces...