Download 2.1 Forces change Motion

Types
of force:
• Applied Force: Requires contact between
objects, like pushing or pulling.
Example: pushing a book across a table.
• Act
at a distance, such as gravity and
electromagnetic forces.
• Friction
is a force that acts in an
opposite direction to the motion.
Frictional
Force
Buoyant
Force
Gravity
Tension
Force
Magnetic
Force
Drag Force
Applied
Force
Spring
Force
•
•
Force has size
& direction,
like a vector.
Shooting a
basketball
requires the
right amount of
force, and
direction to get
it in the hoop.
Circle your level
of understanding of
these concepts:
Balanced forces have same effect
as no force at all.
 Example: Tug of war when the
teams pulling on the rope are
applying an equal force, the rope
does not move.



Unbalanced forces change the
motion of an object.
Example: Tug of war when one team
is applying a larger force then the
other, an unbalanced force occurs
and the rope moves (Like when the
teachers pulled you down in the Pep
Rally)
Circle your level
of understanding of
these concepts:


An object at rest stays at rest and
an object in motion stays in motion
at the same speed and in the same
direction, unless acted on by an
unbalanced force.
What types of forces on Earth
make objects in motion slow
down? ________________


Objects with no net force have constant
or zero velocity.
Force is needed to start or change
motion
Inertia: resistance of an object to a
change in speed or direction of motion


It is more difficult
to change the
motion of an object
that has more
mass.
When you
measure mass of
an object, you are
also measuring
inertia.
Circle your level
of understanding of
these concepts:


Acceleration is produced when a force
acts on a mass.
F = ma; “F” is Force, “m” is mass, and
“a” is acceleration (speed).


For every force, there is a reaction force
of the same size in the opposite direction.
Every act has an equal and opposite
reaction.
Circle your level
of understanding of
these concepts: