What is the net force acting on a car cruising at a constant velocity of 70 km/h (a) on a level road and (b) on an uphill road?

ch1-11: What is the net force acting on a car cruising at a constant velocity of 70 km/h (a) on a level road and (b) on an uphill road?

 

Answer:

Given velocity = 70 km/h

a) since velocity is constant, acceleration equal to zero. the net force on a level road F= m x a

F = m x 0 = zero.

 

b)  on a uphill road.

net force F= m x a = zero .

the net force in both cases is equal to zero since there is no acceleration (constant speed). force depends on acceleration not the surface.

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