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Old Nov 19th 2018, 01:42 PM   #1
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Question A little confused

Hey, I am on an access to higher education course in the UK and have come across the following problem in my workbook:

A car of weight 10780N driving at constant speed along a flat quiet road has resistive forces (friction drag etc.) of 350N acting on it, suddenly the car develops a misfire and its output drops so it now exerts a driving force of 190N. What will happen (initially) to the car? (calculation needed)

I know the car will decelerate initially as the output will be overcome by the resistive forces, but I am struggling with how to show this with a calculation.. I feel like its something very simple I'm missing but have been going round in circles for a while so any help appreciated. I'm quite new to studying physics so go easy on me please
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Old Nov 20th 2018, 02:41 AM   #2
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So , at constant speed resistance is 350N , the push from engine drops to 190N ... the shortfall is 160N

So there is a 160N deceleration force acting

The car has a mass 10780/9.81 = 1099Kg

F=ma .......... a = 160/1099 = 0.146 m/sec/sec
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Old Nov 20th 2018, 07:25 AM   #3
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Ah thatís perfect.. I wasnít seeing the deceleration as a force in its own right at 160 N .. many thanks!
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