Transcript Warm-up

Warm-up
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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
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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