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# Mechanics - Dynamics Watch

1. ii) Total force on car and trailer F = 3900 - 800 - P

3900 - 800 - p = 2600

Can someone please explain why the force T is not part of the total force on the car and trailer?

Thanks
2. (Original post by khanpatel321)

ii) Total force on car and trailer F = 3900 - 800 - P

3900 - 800 - p = 2600

Can someone please explain why the force T is not part of the total force on the car and trailer?

Thanks
If you consider them both separately...
The tension will be acting forwards on the trailer.
The tension will be acting backwards on the car.

These two forces are of equal magnitude and will cancel each other out. So, when you consider them as one system, tension has no effect.
3. (Original post by JLegion)
If you consider them both separately...
The tension will be acting forwards on the trailer.
The tension will be acting backwards on the car.

These two forces are of equal magnitude and will cancel each other out. So, when you consider them as one system, tension has no effect.
Oh ok thank you I see. The car has force of friction acting on it and also tension from the rope.

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