00:01
In this video, we are going to focus on finding out the value of work done when the force as well as displacement is acting in the same direction.
00:09
So suppose here we are having a block of mass m, then here if we draw the free body diagram for this very block, then it will be here such that we are having weight acting in the downward direction and its magnitude will be mg.
00:22
Now here we will be having a normal reaction and that can be written as such.
00:26
Now we will be having here one force and that is suppose f and then here we are having the displacement d in this very direction.
00:36
So we know the formula for work done and that is here we will write the formula in vector form and then we will see how we can simplify it.
00:44
So this is here going to be equals to force dot it will be here displacement.
00:51
So force is basically we can say f that is we have here written and then to be.
00:56
Displacement is also d, but we have to here understand that whenever we take dot product, then we will include cosine of angle between two vectors.
01:05
So here our vectors which are into consideration is f and d.
01:09
So the angle between them is going to be equals to what? 0 because both of them are in the same direction...