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Warm-up 1. If a toy train has a mass of 1.5 kg & accelerates at a rate of 20 m/s2, what is the amount of force acting on it? 2. Make a Venn diagram comparing/contrasting gravity & friction. Warm-up 1. If a toy train has a mass of 1.5 kg & accelerates at a rate of 20 m/s2, what is the amount of force acting on it? Force = mass x acceleration force 30 N = 1.5 kg x 20 m/s2 Warm-up 2. Make a Venn diagram comparing/contrasting gravity & friction. Warm-up Friction •Provides resistance •2 objects rub against each other •3 types •Fluid •Sliding •Rolling •Slows down motion Gravity Both •Pulls 2 objects together •Forces •Act on 2 objects •Have direction •Accelerate •Acts in a direction opposite to the objects motion •Weight = force of gravity •Speeds up motion Newton’s 3rd Law of Motion If one object exerts a force on another object, then the 2nd object exerts a force of equal magnitude in the opposite direction. Courtesy of Charlie Sandor
