00:01
Hello, we have our diagram looking like this.
00:09
Mass 2 is on a plane that is inclined at an angle of theta giving us 30.
00:19
Mass 1 hangs and so our system looks something like this.
00:29
The weight of mass 1 is mass 1 times gravity and tension is t.
00:34
The weight of mass 2 will be mass 2 times gravity.
00:41
There will be a component acting along the plane downwards giving us the weight sine theta.
00:49
The tension is the same as what is acting near the first weight t.
00:58
Friction is mu r.
01:02
We know that there is a perpendicular component of the weight giving us m2g cross theta.
01:11
That component gives rise to normal reaction such that for equilibrium perpendicular to the plane r equals m2g cross theta.
01:24
So our friction which is mu r is simply mu mg cross theta.
01:33
We apply newton's second law to both masses.
01:37
For the first mass, the weight is pulling it downwards so tension is opposing that direction of motion and this net force equals mass 1 times acceleration.
01:48
For the second mass, tension is pulling in the direction of motion so it is positive...