A car is waiting at a stoplight. The car has a mass of 1200 kg. What is the force (magnitude and direction) that the road puts on the wheels?

Question

2) The same car accelerates out of the stoplight at 1.5 m/s2. find the force of friction (magnitude and direction) that the road puts on the wheels.

Answer 1

1) F_Ground = -F_weight = mg = 1200 kg x 9.8 N/kg iin the opposite direction of weight (so up)

2) F_f (only force in horizontal direction) = ma = 1200kg x 1.5 m/s² in the direction of acceleration.

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