air and water resistance
There are many types of forces that oppose motion such as friction, drag and most universal, gravity.
When two forces cancel each other, they are called balanced forces. Nothing happens when balanced forces are involved. Motion and anything else relating to force can only happen when there are unbalanced forces involved. If there are two opposite but unequal forces, then there is a net force. The net force is the difference between the two forces, and it acts in the direction of the strongest force. For example, if there are two people pushing on the same box in opposite directions, and one exerts 10 newtons of force, and the other exerts 15 newtons, then the net force will be 5 newtons, and it will be in the direction of the force applied by the person exerting 15 newtons.
Balanced Forces
If the forces are equal then the net force is 0. If one force is greater than the other than whatever is having the two forces exerted on it will move in the direction of the greater force's direction. The total force will equal the greater force - lesser force. You can draw it in vectors to help visualize. e.g. F1 <------------------*-------> F2 let's say F1 = 5 newtons and F2 = 2 newtons. The combined force would equal 3 newtons going <- direction.
I assume you mean external forces? some examples include the force due to gravity, drag due to air resistance, someone pushing or pulling an object. Basically any force acting on the system that is independent of the system itself
Weight and lift are two forces that affect a bird's flight. Two other forces are drag and thrust.
There are two forces that causes an airplane to be airborne. They are Thrust and Lift. The other two forces resists the airplane's flight. They are Gravity and Drag.
Gravity and drag are two forces that oppose flight. Gravity pulls the aircraft downward, while drag slows the aircraft's forward movement. Both forces must be overcome for an object to achieve and maintain flight.
For no lift, The induced drag will be zero. However, there will still be drag due to viscous forces and pressure forces.
Friction and Drag (air resistance)
Drag forces are contact forces, as they act between a solid object and a fluid (such as air or water) that it moves through. The drag force arises due to the interaction between the object and the fluid surrounding it.
drag
contact forces are those types of forces that result when the two interacting objects are perceived to be physically contacting each other Examples are 1. Frictional force 2. Tension force 3. Normal force 4. Air Drag etc.,
The main forces involved in airplane flight are lift, weight, thrust, and drag. Lift is generated by the wings and opposes weight, keeping the airplane airborne. Thrust, usually provided by engines, overcomes drag, the resistance of the air on the airplane's forward motion. These forces work together to keep the airplane flying and maneuvering in the air.
The four forces are lift, thrust, drag, and weight.
A car will have aerodynamic features to reduce forces of friction and drag. A sleek body style will help do this.
Two forces that resist the forward motion of a bus are air resistance (drag) acting in the opposite direction of movement and friction between the tires and the road surface.