May The Force Be With You!
Motion:
is a change in
position, measured
by distance and
time.
Force
•Any push or pull on an object.
•Starts, stops, or changes the
direction and speed of an
object.
Gravity
The Force of attraction between any two
objects in the universe.
The force which pulls all objects
towards the center of the Earth.
Centripetal
The Force that pulls objects
toward the center keeping them
in a circular motion.
Buoyant Force
An upward force exerted by a fluid.
–Lift
–Drag
–Thrust
Friction
Friction is a force that causes or
stops motion when two surfaces rub
against each other.
Types of friction:
•Static friction – friction force that
acts on objects that are not moving.
•Sliding friction – friction force
that opposes the direction of motion
of an object as it slides over a
surface.
•Rolling friction - friction force that
acts on rolling objects.
•Fluid friction – friction force that
opposes the motion of an object
through a fluid.
Static Friction
Sliding Friction
Fluid Friction
Rolling Friction
•Forces occur in pairs
•Forces are either:
Balanced
Unbalanced
Balanced Forces
•Do not cause a change in motion
•They are equal in size and opposite in
direction.
Unbalanced Forces
•Always cause a change in motion
•They are not equal and are opposite in
direction.
BALANCED FORCES
UNBALANCED FORCES
•That’s it for today …
May the Force be with
you!