T. Rizel D. Florencio
THIRD LAW OF MOTION:
NEWTON’S
FOR EVERY ACTION
THERE IS
AN EQUAL AND
OPPOSITE
REACTION.
INTERACTIONS PRODUCE FORCES
•FORCE is a push or pull.
•The forces exerted by two objects on each
other are often called an action-reaction force
pair.
“For every action, there is
an equal and opposite
reaction”
Whenever one object
exerts a force on a
second object, the
second object exerts an
equal but opposite
force on the first
object.
FOR EVERY ACTION, THERE IS
AN EQUAL AND OPPOSITE REACTION.
•One force is called the
force and the
other force is called the
force.
•Neither force can exist
without the other.
IDENTIFYING ACTION & REACTION
•Object A exerts a force on Object B
then in reverse
Object B exerts a force on object A
Action: tire pushes on road
Reaction: road pushes on tire
IDENTIFYING ACTION & REACTION
IDENTIFYING ACTION & REACTION
•Action: Tyre pushes road
•Reaction: Road pushes tyre
IDENTIFYING ACTION & REACTION
IDENTIFYING ACTION & REACTION
•Action: Rocket pushes gas
•Reaction: Gas pushes rocket
ACTION AND REACTION ON
DIFFERENT MASSES
•A bug with a mass of 5
grams flies into the
windshield of a moving
1000kg bus.
•Which will have the most
force?
•The bug on the bus
•The bus on the bug
THINK!
•The astronauts working on the
space station have a serious
problem when they need to move
around in space: There is nothing to
push on.
One solution is to throw
something opposite the
direction you want to move