Αποτελέσματα Αναζήτησης
Air friction, or air drag, is an example of fluid friction. Unlike the standard model of surface friction, such friction forces are velocity dependent. The velocity dependence may be very complicated, and only special cases can be treated analytically.
But compared to air resistance, friction plays a bigger role in most physics problems and the equation for friction is much easier to work with. In this lesson we'll learn about three different types of friction: static friction, kinetic friction and rolling friction.
What is the equation for the force air resistance, also known as the drag force? We can see that the drag force depends on 4 things (4 variables). Let's take a look at each one.
Learn about projectile motion by firing various objects. Set parameters such as angle, initial speed, and mass. Explore vector representations, and add air resistance to investigate the factors that influence drag.
Equation \ref{6.1} and Equation \ref{6.2} include the dependence of friction on materials and the normal force. The direction of friction is always opposite that of motion, parallel to the surface between objects, and perpendicular to the normal force.
The air resistance that an object encounters is proportional to its cross-sectional area and to its velocity. Notice, that like friction, air resistance opposes motion. That is, if the object is rising through the air, air resistance acts downward; if it is falling, air resistance acts upwards.
27 Σεπ 2020 · Ignoring the effects of air resistance, or drag, allows one to derive simple equations to predict the time of flight, range, and various other parameters of the motion. These equations are, however, only approximations to the true motions of real objects.
