# A 50kg obect falling through the air experiences a drag force of 90N. The acceleration of gravity is 9.8m/s^2. What is the magnitude of the net force on the mass?

Oct 22, 2015

$400 \text{N}$

#### Explanation:

The weight of the object acting downwards $= 50 \text{gN"=490"N}$

The drag which acts in the opposite direction $= 90 \text{N}$

So the net force $= 490 - 90 = 400 \text{N}$

At the point where the weight equals the drag, there is no net force acting on the object. Since Force = mass x acceleration the acceleration is zero and the object moves at constant velocity.

This is known as "terminal velocity".