How many types of friction is there?

Answer 1

Friction is usually classified into two types: static and kinetic friction. Static friction refers to the frictional forces between objects that are not moving. Kinetic friction relates to friction that is produced between objects that are in motion relative to one another.

Answer 2

In total there are 4 distinct forces: The electromagnetic force, the weak nuclear force,

strong nuclear force, and gravitation.

Recently, the electromagnetic force and the weak force has been combined into the

electroweak force. Physicists are aiming to "unify" the other two forces like this.

Answer2:

Forces are the first derivative of energy. Energy is a Quaternion quantity having a scalar/Boson S part and a vector/Fermion V part or a Boson part and a Fermion part.

The energy is W = S + V = [s,V]

The forces is the first derivative

Force F = [d/dr,Del] [s,V] = [ds/dr -Del.V, dV/dr + Del s + DelxV]

There are Five Forces;

1. The Centripetal scalar force: ds/dr

2. The Centrifugal scalar force: -Del.V

3. The Tangent vector force: dV/dr

4. The Gradient vector force: Del s

5. The Curl vector force: DelxV

For example the five forces of Gravity Forces are:

W = -mGM/r + cP = -vh'/r + cP

where the vector force is the Momentum energy cmV=cP, the "Dark Energy"!

F= [d/dr,Del] [-vh'/r, cP] = [vp/r -cDel.P, cdP/dr - Del vh'/r + cDelxP]

F = [vp/r - cp/r cos(P), -cp/r 1P + vp/r 1R + cp/r sin(P) 1RxP]

1. centripetal force: vp/r this is the gravitational attraction force.

2. centrifugal force: -cDel.P= -cp/r cos(P) this is the "Cosmos Divergence" force.

3. tangent vector: cdP/dr = cdP/cdt = dP/dt = mdV/dt

4. Gradient vector: Del -mGM/r = mGM R/r3 = mGM/r2 1R = vp/r 1R

5. Curl Vector: cDelxP = cp/r sin(P) 1RxP this is the circulation/Transverse vector.

At the Boundary/Stationary 0=F Condition there are only 4 forces,

the Curl is zero, 0=DelxV and Newton's Equal and Opposite forces is true.

Answer 3

There are four types of friction that include static friction and fluid friction. The other two types are sliding friction and rolling friction.