SAT Subject Physics Practice Question 673: Answer and Explanation

Next steps

Question: 673

9. A car is driving along a level road at a constant 60 km/hr. The force acting on the car from the tires of the car is

A. equal to the power of the engine.
B. the normal force times the coefficient of friction.
C. larger than the normal force times the coefficient of friction.
D. less than the normal force times the coefficient of friction.
E. zero.

Correct Answer: E

Explanation:

The correct answer is (E). An object that is not being accelerated cannot have any unbalanced forces acting upon it. The car is moving at a constant velocity, which means there are no forces exerted on the car anywhere.

Previous       Next