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PS OGT PRACTICE

PHYSICAL SCIENCE

QuestionAnswer
DENSITY formula: mass divided by volume; in common terms, how heavy something is for its size. By doing this math, you cut the volume down to an equal size so that you have a more equal, fair comparison.
DENSITY applied Compared to density of water, substances with lower density will float; with higher density will sink; substances have characteristic densities
NEWTON'S FIRST LAW inertia: an object in motion stays in motion and an object at rest stays at rest. Application: first gear in car has to have more power to get car moving. Planets stay in motion, always pulled in by gravity, moving away by inertia. Balance=orbit.
Newton’s 2nd Law F = ma (force equals mass times acceleration)Application: weapons
Newton’s 3rd Law for every action there is an equal and opposite reaction. Application: rocket launch
ENERGY TRANSFER Energy cannot be created or destroyed. It can only be transferred from one form to another (i.e. electrical to mechanical)
Types of energy: thermal Heat energy: ALWAYS travels from hot to cold.
Types of energy: mechanical movement (eg. pedaling a bicycle)
Types of energy: chemical produced by chemical reactions (eg. potential: chemicals in a battery, food in your body)
Types of energy: radiant Electromagnetic spectrum...all travel at speed of light; do not need media for transfer. Examples: light, gamma, radio waves
Types of energy: electrical movement of electrons
Created by: Ruth.Miller
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