KOMPAS.com – The force in the opposite direction that occurs when two or more objects rub against each other is called friction. Broadly speaking, the frictional force is divided into static friction and kinetic friction.
Reported from Encyclopedia BritannicaStatic friction is the friction force that acts between the surfaces of objects that are at rest with respect to each other.
Static friction prevent movement, so the two objects do not slide past each other.
However, an object can move if it is within the threshold of motion or the coefficient of static friction.
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Reported from Physics of Boston Universitymoving a stationary object is more difficult than defending a moving object.
This causes the maximum static frictional force to occur when the object is about to move.
Thus, a large enough force is required to move an object at rest. Once the object starts to move, the static frictional force will decrease.
This also causes the coefficient of static friction to be greater than the coefficient of kinetic friction.
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Example of static friction
An example of static friction is when standing on the ground. The ground and feet have a large frictional force.
The static frictional force makes it seem as if the ground grips and holds the feet, so that we can stand upright.
It’s different when we’re standing on a layer of ice. The feet and surface of the ice sheet have less static friction.
Thus, the grip strength of the ice sheet is small. This causes us to often slip and find it difficult to stand upright on the ice sheet.
The next type of friction is kinetic friction. Kinetic friction is the frictional force that acts on two surfaces that are moving and rubbing against each other.
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Reported from Khan Academythe kinetic frictional force opposes the motion of the objects and tries to reduce the speed of the objects rubbing against each other.
That is, the kinetic friction force continues to work to slow down the speed of two objects rubbing against each other.
Kinetic friction has a smaller coefficient of kinetic friction than the coefficient of static friction.
Because, it takes less force to keep an object already in motion than to move the same object from rest.
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An example of kinetic friction
An example of kinetic friction is an object moving against a surface. For example, a rolling soccer ball. A rolling soccer ball gets kinetic friction from the surface on which it is rolling.
The ball will continue to experience kinetic friction which reduces its speed. At some point, the ball will stop rolling and the kinetic friction will stop.
When the ball is stationary on the court, it is the static frictional force that acts to keep it at rest.
The soccer ball will continue to experience static friction until it is given a force from a soccer player’s kick. This force makes the ball move again and again experiences kinetic friction.
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