Science Notes

A detailed Summary of Science Notes

Modern elements are less evocative but more numerous, they make up just over one hundred basic substances

All things consist of particles called atoms

The way molecules behave governs the workings of many machines, such as ships, airplanes, pumps, refrigerators, and combustion engines.

Molecules of gases are so hyperactive that they will fill any space open to them

In liquids, the molecules are less energetic and go haphazardly around in small groups

In a solid, the molecular bonds are strong and hold the molecules firmly together so that the solid is hard and rigid.

The point at which all heat vanishes is called absolute zero

The atoms of elements are made up of even smaller particles - electrons, which form the outer shells of each atom, and protons and neutrons, which make up its nucleus

Water does move out of the way when any thing enters it. But rather than leaving nothing below an immersed object, the water around it pushes back and tries to support the object. If the water succeeds, the object floats.

The density factor, rather that weight, determines whether things float or sink

There are four basic kinds of flaps. Leading-edge flaps, trailing edge flaps, which extend the entire length of the wing to provide more lift and drag, spoilers, and ailerons

By using the downward thrust of its jet engine, the jump jet can dispense with the need for a runway and take-off vertically from the ground

By adjusting the amount of water in the tanks, a submarine's weight and buoyancy can be precisely regulated

Propellers and jet engines move air backward at high speeds and this pushes back to force the aircraft forward

Frees from friction with the water, a hydrofoil can skim over the waves at two or three times the speed of the fastest floating boats

The sail is able to propel the boat at any angle to the wind except head-on. They do this by moving in a zig-zagging pattern to keep the sail always at an angle to the wind

Some common words found in the essay are:
, equal weight, object water, angle wind, action reaction, provide lift, water air, air passing, water move, jet engine,

Approximate Word count = 750
Approximate Pages = 3 (250 words per page double spaced)

Category: Science

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