00:02
Again, we have our two cars linked by a coupling and the tension in the coupling is t, only that it has different directions as you approach the cars.
00:23
The masses of the cars are given again, one megagram is 10 to the power 6 of a gram, where a gram is 10 to the power minus 3 kilograms.
00:35
So 1 megagram then becomes 10 to the power 3 kilograms.
00:39
So this is 10 to the power 3 kilograms or 33 ,000 kilograms and this side is 20 kilograms or 20 times 10 to the power 3 kilograms.
00:57
That is 20 ,000 kilograms.
01:00
The opposing friction in both cases is given as 45 kiloons.
01:11
Again we apply newton's second law to both masses for.
01:23
For format a, we choose a general direction of motion.
01:35
Let's see towards the right.
01:37
So, for mass a, tension is in a direction of motion, so it's positive, but friction is opposing direction of motion.
01:47
So the net force is tension minus friction.
01:49
That should be equal to the, sorry, friction is 45 ,000.
01:55
So net force is tension minus friction.
01:59
That should be equal to the mass times acceleration.
02:05
For b, both tension and friction are opposing the blue line, our choosing direction of motion...