00:01
A free body diagram is shown over here, a force of p pulls on the crate with the mass of m on the rough surface.
00:07
The diagram shows the direction of force that x on the crate in this situation.
00:10
Fn represents the normal force and w represents the weight and f is a friction force, which are the following actions which result an increase in the normal force.
00:18
Let's first make the components, so p cosine of theta and over here we'll have a component of p sine of theta.
00:27
So if we want to change the normal reaction and all right.
00:38
So definitely we have to change either this or the weight, right? we have to do anything on this kind change, at least to bring a change.
00:50
Because the friction force change will not bring any direction, we'll not bring any change in the vertical forces, right? so reduce the coefficient of penetrative friction is not going to work or increase the coefficient of kinetic friction is also not going to work.
01:03
Now, if in the normal, normal situation, let's say at the moment, the normal reaction and p sine theta is actually equal to the weight.
01:11
It means that the normal reaction is actually weight minus p sine theta.
01:15
So if you want to decrease, sorry, if you want to increase the normal force, if we decrease the angle, then definitely the sign will decrease...