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any action that tends to maintain or alter the motion of a body or to distort it.  Friction is the resistance to motion of one object moving relative to another. It is not a fundamental force, like gravity or electromagnetism. Instead, scientists believe it is the result of the electromagnetic attraction between charged particles in two touching surfaces.

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Friction that happens between two bodies in touch when they are at rest is known as static friction. Friction is the force that keeps an item from moving while it is motionless.

Friction that opposes the movement of a moving body is known as dynamic (or kinetic) friction. Friction is what causes an object to slow or stop moving.

static causes friction blisters

Static Friction:
It is associated with body at rest
more magnitude
Denoted as Fs
It is opposition to the beginning of motion
Value can be zero
Shows linear increase up to a maximum value
Acts in the absence of relative motion

Kinetic Friction:

It is associated with motion of object
Comparatively less magnitude
Denoted as Fk
It is the opposition relative to motion of the body
Value can never be zero
Shows invariable nature and remains constant
Acts in the presence of relative motion

“Difference between Static and Kinetic Friction (with Comparison Chart).” Circuit Globe, 17 Feb. 2021, https://circuitglobe.com/difference-between-static-and-kinetic-friction.html.

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The law of conservation of energy asserts that the energy of an isolated system remains constant throughout time  Energy cannot be created or destroyed; it can only be altered or moved from one form to another.

A conservative force is just affected by the object's location. If a force is conservative, the potential can be assigned a numerical value at any time. When an item moves from one point to another, the force alters the object's potential energy in a way that is independent of the path followed.

If a force is not conservative, it is impossible to define a scalar potential since alternative pathways would result in potential differences between the start and end positions that would contradict.

Boundless. “Boundless Physics.” Lumen, https://courses.lumenlearning.com/boundless-physics/chapter/potential-energy-and-conservation-of-energy/#:~:text=The%20work%2Denergy%20theorem%20states,v%200%202%20%3D%20%CE%94%20KE%20.

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When the ratio of the frictional force resisting movement of contacting surfaces to the normal force applying pressure the two surfaces together.

equation: μ = F/N

F is the frictional force and N is the normal force

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positive impacts:
1) sledding in the snow: friction is between the sled and the ground
2) Writing on notebook: friction between the pen/pencil and the paper
3) lighting a matchstick: friction is in between the matchstick and the lighting part of the box

Negative:

Blisters: Caused when the skin and something rubs on it, producing heat and skin peeling

forest fires: caused due to the friction between tree branches

wet/ice roads: the friction doesn't function well with the tires and the road and allows for accidents to occur

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calculating the coefficient of friction between two surfaces

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calculating the coefficient of friction between two surfaces

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Say we have a box that is is fastened to a plate by a rope passing via a pulley, it's weight at 7 kg. The block wouldn't move at first when the plate is empty due to friction between the block and the table. if we gradually start adding weights to the plate and stop when the block until it starts to slide over the table, the frictional force between the block and the table would ultimately equal the sum of the weights plus the weight of the plate. This ratio of the frictional force to normal force would then be the coefficient of friction.