Grade 9 Science Exam Prep - Trillium Woo PDF

Name Symbol Unit Formula Density D g/cm3 m/V (1 m з = 1000L 1 cm з = 1ml) Volume...

Name Symbol Unit Formula Density D g/cm3 m/V (1 m з = 1000L 1 cm з = 1ml) Volume V Cm3 m/V Mass m Grams (g) DxV Voltage V Volts (V) IxR Resistance R Ohms (Ω) V/I Current I Amperes (A) V/R Energy(Watt) E Joules (J) Charge Q Coulomb (C) Time T Seconds (s) Neutrons Not - nor + Mass - Protons Density - The mass of a substance per unit volume. It can illustrate how ‘compact’ the particles are within a substance. Any substance that is more dense than its surrounding will sink. Any substance that is less dense than its surroundings will float. Resistance - Resistance is a property of a substance to hinder the movement of electricity and turn it into another form of energy (like heat). Low resistance things, like copper, mean that there's nothing trying to stop the flow of electrons. High resistance means there's many things trying to stop the flow of resistance, like tungsten wires in light bulbs Factors of Resistance - Length, Thickness, and Tempature Length - Shorter = electrons get through quicker (low resistance) Longer = electrons get through slower (high resistance) Thickness - Thicker = electrons can flow through easily (low resistance) Thinner = electrons have to squeeze through (high resistance) Temperature - Hotter = electrons move quicker (high resistance) Colder = electrons move slower (Low resistance) Atoms ➡ Compounds ➡ Molecules