Friction, why friction is called a necessery evil?

why friction is called a necessery evil?

Forces and nature,

Explain intermolecular force, When two molecules approach each other, the c...

When two molecules approach each other, the charges in each are disturbed and redistributed in a fashion that the average distance among the unlike charges in the two molecules is

S polarization, derive the equation for reflection and transmission coeffic...

derive the equation for reflection and transmission coefficient for s polarization

Atom, what is an atom

what is an atom

Electrostatics, can whole charge of a body be transfered to other?

can whole charge of a body be transfered to other?

Biot-savart law, Biot-Savart law (J.B. Biot, F. Savart) A law defines ...

Biot-Savart law (J.B. Biot, F. Savart) A law defines the contributions to a magnetic field through an electric current. This is analogous to Coulomb's law. Mathematically spec

Balanced forces - problems with sitting still, Example 1 - A bird feeder in...

Example 1 - A bird feeder in your yard has a total mass of 3.0 kilograms and is supported as shown. What is the force on the top wire? The bird feeder is not falling so the forc

Dimensions, what are the application of dimensions?

what are the application of dimensions?

Conservation of momentum, In a pool game a .17kg cue ball traveling at .75 ...

In a pool game a .17kg cue ball traveling at .75 m/s in the plus x direction hits a stationary eight ball. The eight ball moves off with velocity of .25 m/s at an angle of 37 degre