NEWTON’SFIRST LAW OF MOTION
Basic Idea: Inertia = Resistance to change in motion.
LAW:
Objects at rest will remain at rest and objects in motion will remain in motion at constant velocity unless acted on by an unbalanced force.
When the blue ball starts moving the red ball resists motion. (Objects at rest stay at
rest)
Newton’s First Law: Inertia
When the blue ball stops moving the red ball continues motion. (Objects in motion stay
in motion)
The truck is stopped by an unbalanced force.
The ladder keeps going!
The spaceman stays at rest,
until an unbalanced force causes movement.
Newton’s First Law: Inertia
NEWTON’SSECOND LAW OF
MOTIONBasic Idea:
LAW:
Force is related to mass and acceleration.
Force = (Mass) (Acceleration)
Standard Unit of Force = Newton (N)
Newton’s Second Law: F = ma
Small Mass
Large Mass
Equal Force
accelerates quickly from force
accelerates slowly from same force
Newton’s Second Law: F = ma
Small Force
Large Force
Same Mass
Accelerates mass quickly
Accelerates same mass slowly
NEWTON’STHIRD LAW OF
MOTIONBasic Idea:
LAW:
Forces come in pairs.
For every action there is an equal and opposite reaction.
Newton’s Third Law: Action/Reaction
Man pushes off left (Action)
Man travels right (Reaction)
ACTIONREACTION
Newton’s Third Law: Action/Reaction
Bear applies
action force on
ground
Reactio
n forc
e
from
gro
und sends
bear up
Action Down:
Reaction Up
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