Question #3fd94

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Question #3fd94

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Answer 1 · 2016-04-30T17:34:27

1036N,1036N and 2590N

Explanation:

The trailer is accelerated at $1.85 m s^{- 2}$ $1.85ms^-2$ . Hence the force exerted on it, by Newton's 2nd law, is given by:
$F = m a = 560 \cdot 1.85 = 1036 N$ $F=ma=560*1.85=1036N$

Newton's 3rd law tells us that if the car exerts a force on the trailer, then the trailer exerts an equal an opposite force on the car. So the answer is $1036 N$ $1036N$

The caravan and car are both accelerating at the same rate. So the engine must be providing a force given by:
$F = m a = (1400 + 560) \cdot 1.85 = 3626 N$ $F=ma=(1400+560)*1.85=3626N$

The net force on the car must therefore be:
Force provide by engine less force exerted by trailer $= 3626 N - 1036 N = 2590 N$ $=3626N-1036N =2590N$

Or you could just say the car is accelerating and therefore the net force must be:
$F = m a = 1400 \cdot 1.85 = 2590 N$ $F=ma= 1400*1.85 =2590N$

i.e. you get to the same answer

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Question #3fd94

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