Homework Help: physics

Posted by nate on Thursday, September 13, 2012 at 9:53pm.

The engine of a 1250 kg car provides a forward directed force of 3,560 N. If the car accelerates at a rate of 2.60 m/s2, what is the total resistive force (wind resistance, friction, etc.) acting on the car?

physics - drwls, Friday, September 14, 2012 at 5:52am
With zero resistive force, the acceleration would be
a = F/M = 2.848 m/s^2

Since it is only accelerating at 2.60 m/s^2, the resistive force is:

F - Fbackward = M a
Fbackward = F - M a
= 3560 - 2.60 M

Fbackward = 310 N

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