what are the differences between static and kinetic friction?
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Static friction is what keeps the box from moving without being pushed, and it must be overcome with a sufficient opposing force before the box will move. Kinetic friction (also referred to as dynamic friction) is the force that resists the relative movement of the surfaces once they're in motion.
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Friction, by its nature, always acts opposing the relative motion between two surfaces. work done by friction can be zero, when there is no relative motion. But positive work cannot be done under any circumstances, if you see it from a reference frame fixed to one of the two surfaces.
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Also, changing the types of surfaces sliding across each other will change the amount of kinetic frictional force. The "roughness" of two surfaces sliding across each other is characterized by a quantity called the coefficient of kinetic friction μk​mu, start subscript, k, end subscript.
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Friction always works in the direction opposite to the direction in which the object is moving, or trying to move. Friction always slows a moving object down. The amount of friction depends on the materials from which the two surfaces are made. The rougher the surface, the more friction is produced.
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The Force of Static Friction keeps a stationary object at rest! Once the Force of Static Friction is overcome, the Force of Kinetic Friction is what slows down a moving object!
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Magnetic force, Electrostatic force, Gravitational force etc. Force of friction is not a conservative force since the work done by it depends on the path taken.
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Static, sliding, and rolling friction occur between solid surfaces. Static friction is strongest, followed by sliding friction, and then rolling friction, which is weakest. Fluid friction occurs in fluids, which are liquids or gases.
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Mathematically, μ = F/N, where F is the frictional force and N is the normal force. Because both F and N are measured in units of force (such as newtons or pounds), the coefficient of friction is dimensionless. The coefficient of friction has different values for static friction and kinetic friction.
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Feel the difference with Kinetic Sand! ... Different from classic Kinetic Sand, Kinetic Beach Sand is made with larger grains of natural sand. This cool sand feels like wet beach sand but won't stick to anything but itself. It leaves your hands completely dry and never greasy.
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Friction produces static electricity by initiating the transfer of electrons between two or more objects. With regards to electron transfers, objects are either conductors or insulators. Conductors give up electrons readily because the electrons are not confined to a particular atom.
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When there is no any relative motion, the friction is known as static friction. When a body slides over another one, the friction acting there is known as sliding or kinetic friction. When a body rolls over another one, the friction acting there is known as rolling friction.
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The condition Fnet=0 F net = 0 must be true for both static equilibrium, where the object's velocity is zero, and dynamic equilibrium, where the object is moving at a constant velocity. Below, the motionless person is in static equilibrium. The forces acting on him add up to zero. Both forces are vertical in this case.
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Potential vs. Kinetic Mechanical Energy. There are two types of mechanical energy: potential energy (stored energy of position) and kinetic energy (energy of motion).
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There are four types of friction: static, sliding, rolling, and fluid friction. Static, sliding, and rolling friction occur between solid surfaces. Fluid friction occurs in liquids and gases. All four types of friction are described below.
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Velocity is limited by friction, because it stops acceleration at a certain point. Friction is related to velocity in that it acts to reduce velocity. In other words it causes moving objects to decelerate. The friction force may also act as one of the forces in a moment that is causing motion.
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Static Friction Force depends upon the mass of the object. higher the mass of the objects , higher the force required to impend motion. Static Friction Force = mass of object X friction coefficient.
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Friction always works in the direction opposite to the direction in which the object is moving, or trying to move. Friction always slows a moving object down. The amount of friction depends on the materials from which the two surfaces are made.