Answer with Explanation:
Drag and lift are the forces that act on an object which moves in a fluid and are explained as under:
1)Drag: Drag is the force that opposes the motion of an object moving in a fluid and hence is analogous to fluid frictional force in a fluid. Power is needed to be spent by an object to overcome the frictional drag. The drag force is different from the classical friction as we know that the frictional force on a dry surface is independent of the velocity of the object but for drag the force is proportional to the square of the velocity of the object.
Mathematically
where
is a constant known as coefficient of drag and A is the projected area of the object.
2) Lift: Lift force is a component of the force that a fluid exerts on an object moving in it that counters the weight of the object and hence has the tendency to lift the object and hence is known as lift force. The lift force is perpendicular to the incoming fluid. Lift force is useful as it allows the aeroplanes to fly as the lift force that is generated by the air on the wings of the plane is used to overcome the force of gravity on the plane.
Mathematically
where
is a constant known as coefficient of lift and A is the projected area of the object moving with velocity 'v'.