Question

# When driving at a constant velocity, why do you need to press on the accelerator? Group...

When driving at a constant velocity, why do you need to press on the accelerator?

a. The engine exerts a force to counteract friction and wind resistance.

b. A force is always required to maintain constant velocity.

c. The engine creates the velocity as you drive.

d. This actually has no effect, it's just a habit.

Ans: (a) The engine exerts a force to counteract friction and wind resistance.

Explanation:

(a) When a car moves in a rod , there is a opposite force due to the wind flow and a frictional force acting on the tires of the car to prevent the motion of the car. So if we want to maintain the constant velocity of the car , the car engine has to create a force against the wind resistance and friction.i.e.we have to give an acceleration to create the force.So we should press the accelerator.....this is correct option.

(b) Now at constant velocity acceleration is zero.so force is zero so in the absence of any resistance we don't need to apply any force to maintain the constant Velocity...this option is incorrect.

(c) engine create force against resistance not the velocity....this option is incorrect

(d) as we have proper reason this option also incorrect.

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