(adsbygoogle = window.adsbygoogle || []).push({}); 1. A car of mass 1000kg is towing a trailer of mass 650kg and the two have an acceleration of 2,3m/s^2. Assuming that the only external force is the driving force between the wheels and the road, calculate:

1: the value of this force

2: the tension in the coupling between the car and the trailer.

I'm a little unsure about this question. When it says 'external force', the driving force between the wheels and the road, it does just mean the driving force, right? And not the frictional force?

Also, my calculations for tension have come out at 0N. But I think there must still be a Tension/resultant force between the two vehicles as they are not moving at a constant velocity. Do I need to calculate in car and trailer tension separately?

2. F=ma

F-T=ma

3.

(a) F=(1000kg+650kg)2.3m/s^2

=2500N (2sf)

(b) F-T=ma

T=F-ma

T=2500-2500=0

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# Homework Help: External forces

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