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than UV, and finally the deadly gamma rays have the most amount of
energy.

Force is a push or a pull, like pulling a wagon or pushing a car.

A force field is an invisible area around an object within which that object
can cause other objects to move. A force field can be attractive (pull an
object towards it) or repulsive (push an object away).

The four force fields are gravity, magnetic, electric, and electromagnetic.

Changing from a liquid to a solid is called freezing. Freezing point is the
temperature at which a material changes from liquid to gas. Objects release
heat as they freeze.

The fundamental strong force holds the quarks together inside the proton
and neutron.

Gases have no bonds between the molecules.

Gravity is a force that attracts things to one another. Gravity accelerates all
things equally. This means all things speed up the same amount as they fall.

All bodies (objects) have a gravitational field. The larger a body is, the

greater the strength of the gravitational field.

Heat is the movement of thermal energy from one object to another. Heat
can only flow from an object of a higher temperature to an object of a lower
temperature. Heat can be transferred from one object to another through
conduction, convection and radiation.

Light travels like a wave and interacts like a particle. Light exists in tiny
packets called photons, which can be defined by four things: intensity (how
bright), frequency (or wavelength), polarization (the direction of the electric

field), and phase (time shift).

Objects can either be a light source (like the sun) or reflect light (like the
moon).

Light can change speeds, but the maximum light speed is through a

vacuum (186,000 miles per second). Light changes speeds when it passes
through a different material (like water, glass, or fog).

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