## What is the downward force that acts on an airplane in flight lift drag thrust gravity?

An airplane in flight is acted on by four forces: lift, the upward acting force; gravity, the downward acting force; thrust, the forward acting force; and drag, the backward acting force (also called wind resistance). Lift opposes gravity and thrust opposes drag .

drag

## Is drag equal to thrust?

In level flight, lift equals weight and thrust equals drag when the plane flies at constant velocity. When the thrust becomes greater than the drag, the plane will accelerate forward. If drag becomes greater than the thrust a deceleration will occur.

## What is the lift equation?

The lift equation states that lift L is equal to the lift coefficient Cl times the density r times half of the velocity V squared times the wing area A. The combination of terms “density times the square of the velocity divided by two” is called the dynamic pressure and appears in Bernoulli’s pressure equation.

## How drag affects speed?

Does Drag Increase with Speed? As an aircraft’s speed increases, drag on the aircraft generally increases much faster. Doubling the speed makes the airplane encounter twice as much air moving twice as fast, causing drag to quadruple. Drag, therefore, sets practical limits on the speed of an aircraft.

## What direction is drag force?

Drag is a force and is therefore a vector quantity having both a magnitude and a direction. Drag acts in a direction that is opposite to the motion of the aircraft. Lift acts perpendicular to the motion.

## What is B in drag force?

So, the shape of the object influences the value of “b”, the density of the fluid influences “b”, and so on. This means that we can write the air resistance force (or drag force) as fdrag = bv for very small, slow objects, or fdrag = bv2 for “human-size objects, depending on the situation.

## What is drag force at terminal velocity?

At terminal velocity, Fnet=0. Thus, the drag force on the skydiver must equal the force of gravity (the person’s weight). Using the equation of drag force, we find mg=12ρCAv2.

## Does mass affect drag force?

The drag on a solid, rigid object isn’t affected by the object’s mass. However, drag is just the portion of the force on the object that’s due to the fluid. The net force on the object will of course be affected by the object’s mass, assuming that gravity is one of the forces on the object.