Examples of rolling friction are a roller skate slowing down on pavement or the wooden surface of a roller-skate rink and a basketball rolling across the surface of the court. When one surface rolls across another, small indentations on both surfaces interfere with each other, reducing speed.
Friction is a requirement for the beginning, ending and alteration of the movement of a wheel or other rolling object. When a car spins its tires against the road, friction is necessary to stop the slippage and allow the tires to get purchase on the ground and begin their rolling motion. As the tires move, though, the interaction between the indentations on the tire and the indentations on the ground builds a torque that slows the angular velocity of the tire.
As the rolling motion takes place, the shape of both objects change as well. For example, the wheel flattens slightly, while the surface develops a trench that holds the entire flattened edge of the wheel. The force of the friction spreads throughout the whole area at which the surfaces come into contact with one another. The front of the wheel also shrinks a bit in response to making a type of plowing motion along the surface.Learn More
Some examples of static friction between two substances or objects are: glass on glass, tire on concrete, tire on snow, tire on a wet surface and steel on steel. Friction is the force between two objects in contact with each other that will resist an attempt to move them. Static friction is the force that will resist the movement up until it is overcome by a greater force and the motion occurs.Full Answer >
Examples of second class levers include doors, staplers, wheelbarrows and can openers. In a second class lever, the load is found between the effort and the fulcrum. The direction of the effort and the load are the same.Full Answer >
Examples of six simple machines include windmills, slides, chisels, drills, blinds and seesaws. A windmill is a wheel and axle, slides are inclined planes, a chisel is a wedge, a drill is a screw, blinds are pulleys and a seesaw is a lever. Simple machines allow humans and animals to do work more easily by lessening the amount of force needed to move objects.Full Answer >
Examples of reciprocating motion include a rack and pinion mechanism, a Scotch yoke mechanism and a traversing head shaper. These examples define this repetitive, up-and-down or back-and-forth linear motion.Full Answer >