00:01
Hello, we pull down our diagram.
00:10
Now let's call the mass on the plane m1.
00:12
Its weight is m1g.
00:14
The component acting along the plane is m1g sign theta, where theta is the angle of inclination.
00:26
The component acting perpendicular to the plane is m2g cost theta.
00:34
This is stated to another mass, whose weight is m2g sorry this is you are still on m1 here so it's m1g equals theta there is normal reaction r there is friction which is mu r from the perpendicular equilibrium we can establish that r equals m1g cost theta our mu is given as 0 .2 so we can find a net force by subtracting okay we did indicate that there is t pointing away from the masses.
01:17
So we actually apply newton second law to both masses.
01:23
Net force equals mass times acceleration.
01:40
So applying this to mass 1, the net force is downward.
01:48
The body is moving down the slope.
01:50
We are assuming that and you could choose up the slope as your direction and you get to the same conclusions...