The braking accelration for a car based on data in a driver's handbook is -12.2 ms^-2. If the car has a mass of 925 kg, find frictional force and state the direction
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If "to the right" is taken to be positive as usual, Fe is positive, and Ff negative. Note that friction always opposes the direction of pending motion. Applying Newton's 2nd law:
ΣF = Ma ; Fe - Ff = Ma ; Fe - 1500N = (850kg)(2.4m/s2) ; Fe = 1500N + 2040N = 3500N
Note that the 2040N must be rounded to 2 significant figures and then added to the 1500N.
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