1. 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.

2. 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 = 1.5 kg x 20 m/s2
30 N = 1.5 kg x 20 m/s2

3. Warm-up
2. Make a Venn diagram comparing/contrasting gravity & friction.

4. Warm-up Friction Gravity Provides resistance Both
2 objects rub against
each other
3 types
Fluid
Sliding
Rolling
Both
Pulls 2 objects together
Weight = force of gravity
Speeds up motion
Forces
Act on 2 objects
Have direction
Accelerate
Slows down motion
Acts in a direction opposite
to the objects motion

5. 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.

6. Courtesy of Charlie Sandor