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Air resistance is the frictional force that opposes an object’s motion through the air (the drag force in the air). When Fares is cycling and skateboarding, he is moving through the air. When Fares is diving underwater, he is moving through water.
The air resistance is a special type of frictional force that acts upon objects as they travel through the air. The force of air resistance is often observed to oppose the motion of an object. This force will frequently be neglected due to its negligible magnitude (and due to the fact that it is mathematically difficult to predict its value).
Friction is a force that is around us all the time that opposes relative motion between systems in contact but also allows us to move (which you have discovered if you have ever tried to walk on ice). While a common force, the behavior of friction is actually very complicated and is still not completely understood.
Kinetic friction acts opposite the object’s sliding direction. Kinetic friction always opposes the object’s sliding direction. As seen in Figure 3 below, if an object is moving up an incline, the force of friction f k points down the incline. If the object is moving down an incline, the f k points up the incline.
At small but nonzero speeds, friction is nearly independent of speed. Figure 6.4.1: Frictional forces, such as f , always oppose motion or attempted motion between objects in contact. Friction arises in part because of the roughness of the surfaces in contact, as seen in the expanded view.
Friction is a force that opposes relative motion between systems in contact. There are several forms of friction. One of the simpler characteristics of sliding friction is that it is parallel to the contact surfaces between systems and is always in a direction that opposes motion or attempted motion of the systems relative to each other.
Linear Velocity Dependence. For objects moving at relatively low speeds through a liquid, where turbulence is not a significant factor, then the viscous resistance to the object's motion is approximately proportional to its velocity. Even in gases there are circumstances where the frictional resistance is approximately proportional to the velocity - such as the motion of tiny dust particles ...
