00:01
Now suppose we have these four mass point mass, a, b, c, and d.
00:07
Each one of them has mass equal to 8 kilograms.
00:12
And the distance between a b, b, b, c, c, d, and ad is l, which is 2 meter.
00:21
Okay, so suppose now we are looking at what's a net force applying on a.
00:26
So this net force come from b, c, and d separately, which are f1, f2, and f3.
00:35
So the net force is the sum of these three forms.
00:39
But force is vector.
00:43
So it does not only have the magnitude, it also has a direction.
00:48
So f1 is upward, f3 is rightward, f3, f2 is from a to c...