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Warm-upWarm-up
1. If a toy train has a mass of 1.5 1. If a toy train has a mass of 1.5 kg & accelerates at a rate of 20 kg & accelerates at a rate of 20 m/sm/s22, what is the amount of force , what is the amount of force acting on it?acting on it?
2. Make a Venn diagram 2. Make a Venn diagram comparing/contrasting gravity & comparing/contrasting gravity & friction.friction.
Warm-upWarm-up
1. If a toy train has a mass of 1.5 1. If a toy train has a mass of 1.5 kg & accelerates at a rate of 20 kg & accelerates at a rate of 20 m/sm/s22, what is the amount of force , what is the amount of force acting on it?acting on it?
Force = mass x accelerationForce = mass x acceleration
forceforce = 1.5 kg x 20 m/s = 1.5 kg x 20 m/s2230 N = 1.5 kg x 20 = 1.5 kg x 20 m/sm/s22
Warm-upWarm-up
2. Make a Venn diagram 2. Make a Venn diagram comparing/contrasting gravity & comparing/contrasting gravity & friction.friction.
Warm-upWarm-up
FrictionGravity
Both
•Provides resistance
•2 objects rub against each other
•3 types•Fluid•Sliding•Rolling
•Slows down motion
•Acts in a direction opposite to the objects motion
•Pulls 2 objects together
•Weight = force of gravity
•Speeds up motion
•Forces
•Act on 2 objects
•Have direction
•Accelerate
Newton’s 3Newton’s 3rdrd Law of Motion Law of Motion
If one object exerts a force on If one object exerts a force on another object, then the 2another object, then the 2ndnd object exerts a force of equal object exerts a force of equal magnitude in the opposite magnitude in the opposite direction.direction.
Courtesy of Charlie Sandor