Physicists have been at the front line of all this; from determining the coefficent of friction for both the wax and the ski, to helping skiers change their technique based on the laws of physics. To maximize speed, Nordic skiing is more about form than probably any other sport. Brute strength and athletic prowess certainly have their advantages, but these pale in comparision to proper technique. While the shape of classic skis is slightly different than that of skate skis, the real difference is that classic skis have a "kick zone.
SIGNED GÜBELIN, CIRCA 1975
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The first peculiarity of inclined plane problems is that the normal force is not directed in the direction that we are accustomed to. Up to this point in the course, we have always seen normal forces acting in an upward direction, opposite the direction of the force of gravity. But this is only because the objects were always on horizontal surfaces and never upon inclined planes. The truth about normal forces is not that they are always upwards, but rather that they are always directed perpendicular to the surface that the object is on. The task of determining the net force acting upon an object on an inclined plane is a difficult manner since the two or more forces are not directed in opposite directions. Thus, one or more of the forces will have to be resolved into perpendicular components so that they can be easily added to the other forces acting upon the object. Usually, any force directed at an angle to the horizontal is resolved into horizontal and vertical components.
Inclined Plane – Simple Machines
Please join StudyMode to read the full document. It consists of a quarter circle block attached to a cantilevered arm with a rectangular surface on the other end. The pivot point on the arm corresponds to the center of radius of the block.
An inclined plane , also known as a ramp , is a flat supporting surface tilted at an angle, with one end higher than the other, used as an aid for raising or lowering a load. Inclined planes are widely used to move heavy loads over vertical obstacles; examples vary from a ramp used to load goods into a truck, to a person walking up a pedestrian ramp, to an automobile or railroad train climbing a grade. Moving an object up an inclined plane requires less force than lifting it straight up, at a cost of an increase in the distance moved. Due to conservation of energy , the same amount of mechanical energy work is required to lift a given object by a given vertical distance, disregarding losses from friction , but the inclined plane allows the same work to be done with a smaller force exerted over a greater distance.