Reflection

Refraction

Diffraction

Critical angle

The return of light or sound waves from a surface is called reflection

Due to Inertia

Coin is too heavy

There is magnet beneath table

Coin is not linked with Paper

Objects at rest, tends to remain at rest is called inertia

Torque

Force

circular motion

Push

Torque is a measure of the force that can cause an object to rotate about an axis

Dielectric constant

Force

Angular Momentum

Torque

These quantizes don't follow law of vector addition. Dielectric is a tensor quantity

The definition of force

The measure of force

The forces always exist in pairs

The total quantity of motion

First law of motion gives the definition of force.

Frictional Force

Gravitational Force

Strong Force

Electromagnetic Forces

Friction is non-conservative because the amount of work done by friction depends on the path

one billion joules

250000 joules

500 Joules

3000 Joules

An average bolt of lightning, striking from cloud to ground, contains roughly one billion joules of eneregy

Moon's gravity

Sun's gravity

Sea breezes

Global Warming

The sea level rises at night because of the influence of the moon's gravity

Temperature differences

Air flows from high density to low density.

air flows along isobars

air flows down-hill

The temperature difference at different areas of land cause change in atmospheric pressure. Hence Winds flow

gravity travels at the speed of light

gravity travels at 9.8 meters per second per second

(32 feet) per second per second

gravity travels at twice of speed of light

According to Einstein's General Relativity, gravity travels at the speed of light.