Question

Hello, I have three questions.

1. What happens to the amount of air resistance on your car as you drive faster?

2. When will an object falling through air reach terminal velocity?

3. What is the net force and acceleration of an object that has reached terminal velocity?

Answer 1

Sol. a) As you drive faster, the amont of air resistance or drag on the car increases. Air resistance is the resistance offered by the air which is impacting an object when it is moving.

b) As the speed of an object increases, so does the drag force acting on it, which also depends on the substance it is passing through (for example air or water). At some speed, the drag or force of resistance will equal the gravitational pull on the object. At this point the object ceases to accelerate and reach the terminal velocity ( the highest velocity attainable by an object as it falls through a medium ).

c) When an object reach the terminal velocity it moves at a constant velocity therefore ,

Acceleration ,a= 0 and Force = m*a = 0              At terminal speed .

So, the acceleration and force on the object are zero at the terminal velocity .