Question

If the velocity is a CONSTANT 60 km/hr, then the Driving Force applied by the car's engine is _________ the Frictional Force.

* equal to
* greater than
* less than

Answer 1

Thus: The Driving Force applied by the car's engine is equal to the Frictional Force.

Step-by-step explanation:

Acceleration

According to Newton's second law of motion, the acceleration of an object is directly proportional to the net force F and inversely proportional to the object's mass:

`\displaystyle a=(F)/(m)`

An object moving at constant speed has zero acceleration and it can only happen if the net force is zero.

We are told the car's engine is applying a driving force. If no friction was encountered, then the car would move with an acceleration different from zero.

Given its acceleration is actually zero, the driving force is being opposed by the friction force with a magnitude of equal value.

Thus: The Driving Force applied by the car's engine is equal to the Frictional Force.