sliding in a slide
Some simple effects of static friction are car tires when they are not sliding. While a car is rolling, the point on the wheels that is touching the ground is moving with zero velocity. Thus, contrary to popular belief, this is an example of static friction, not kinetic. Another is a box sitting on an incline, and yet another is you sitting in a chair at this computer. Each is a case of friction in which two objects contact each other and do not move.
Sliding and rolling friction
Static: A cars wheels (while car and wheels are stopped, or while car is moving and wheels are rolling), a doorstop, a rock on a hill (not sliding down) and the force keeping a nail in some wood. Sliding: A cars wheels (during burnouts or when brakes are applied too hard and the car skids), dragging a computer mouse along a table, Ice skaters blades and a drink slid down the bar to you.
Kinetic friction is commonly thought of as the friction between two objects while those two objects slide against each other. To determine the coefficient of kinetic friction (for an object under the influence of gravity on some surface), one needs to determine the angle at which the sliding object moves at a constant speed down the other object (think of a flat piece of rubber sliding down a flat plank of wood). This is different from static friction where the sliding object has some applied force to move along a surface, but that object is stationary because of the friction applied by the surface. To determine the coefficient of static friction, one needs to determine the angle at which the sliding object begins to move down the surface.
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Some simple effects of static friction are car tires when they are not sliding. While a car is rolling, the point on the wheels that is touching the ground is moving with zero velocity. Thus, contrary to popular belief, this is an example of static friction, not kinetic. Another is a box sitting on an incline, and yet another is you sitting in a chair at this computer. Each is a case of friction in which two objects contact each other and do not move.
Sliding and rolling friction
Friction occurs when you rub your hands together, slow down a moving object (e.g. a car braking on a road), or when you walk on a rough surface.
friction
Some examples of relatively high friction surfaces are: sand paper, grass, and asphalt. In general, the rougher the surface, the more friction it has.
Static: A cars wheels (while car and wheels are stopped, or while car is moving and wheels are rolling), a doorstop, a rock on a hill (not sliding down) and the force keeping a nail in some wood. Sliding: A cars wheels (during burnouts or when brakes are applied too hard and the car skids), dragging a computer mouse along a table, Ice skaters blades and a drink slid down the bar to you.
Kinetic friction is commonly thought of as the friction between two objects while those two objects slide against each other. To determine the coefficient of kinetic friction (for an object under the influence of gravity on some surface), one needs to determine the angle at which the sliding object moves at a constant speed down the other object (think of a flat piece of rubber sliding down a flat plank of wood). This is different from static friction where the sliding object has some applied force to move along a surface, but that object is stationary because of the friction applied by the surface. To determine the coefficient of static friction, one needs to determine the angle at which the sliding object begins to move down the surface.
gravatational forces' friction forces, .
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gravatational forces' friction forces, .
ice skating on ice ,is one friction occurring
maybe friction cause it makes your shoes torn out sometimes