Physical Quantities and Units 0.0 / 5 ? PhysicsFoundation of PhysicsA2/A-levelOCR Created by: IvegotnojamsCreated on: 01-09-21 22:58 What is Quantity? It is the amount of something e.g. number of cards in a deck; 52 1 of 11 What is unit? A standard measure of a quantity e.g. Metres for distance 2 of 11 Quantity example Pt 1. Scalar (depended on magnitude) e.g. mass of an object 3 of 11 Quantity example Pt 2. Vector (depended on direction) e.g. velocity or acceleration 4 of 11 What is SI unit? (Base/Fundamental) A complete metric system of units of measurement, internationally agreed upon and universally used. 5 of 11 What are the 6 SI unit? (only 6 for A-level) Time (s); Length (m); Mass (kg); Current (A); Temperature (K) & Amount of substance (mol) 6 of 11 What is Derived Quantity (Unit)? Derived quantities are physical quantities derived from combinations of base quantities through multiplications 7 of 11 Give an example of a derived unit F (force) = m (Mass) × a (acceleration) ---> N = kg ms^-2 8 of 11 What is prefix? A prefix is a symbol that you place in front of a unit e.g mm--> m (milli) m (metre) 9 of 11 Why is prefix used in physics? A measurement can be unusually too small or large which makes it difficult to work with, hence prefix is used 10 of 11 Give an example of prefix in physics Name: Giga Symbol: G Multiple of: 10^9 11 of 11
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