Download what is a force?

WHAT IS A FORCE?
TEST REVIEW
DEFINE FORCE:
A push or pull one body exerts on
another
 Forces always come in pairs.

WHAT IS NET FORCE?
Net force is a force that results
from unbalanced forces acting on
an object
 CHANGES THE MOTION OF AN
OBJECT!!

ENERGY:
POTENTIAL ENERGY- the energy of
objects due to their position or
condition or the energy an object could
have.
 KINETIC ENERGY- energy of motion

WHAT IS ACCELERATION?
The rate at which velocity changes
 Acceleration depends on the net
force acting on the object and on
the mass of the object.

VELOCITY:

The speed AND direction of a moving
object.
MOMENTUM:
The mass of an object multiplied
by its velocity.
 “BASHING POWER”

WHAT IS MASS?
Mass is the amount of matter in an
object.
 The measure of inertia of a body.

INERTIA IS:

The property of a body that resists
change in velocity.
FRICTION:
The force that opposes motion between
two surfaces that are touching each
other.
 Air resistance- the force of air against a
moving object also called drag.

NEWTONS LAWS:



Newton’s First
Law of Motion:
OR the Law of
Inertia
this law states: an
object at rest tends
to stay at rest and an
object in motion
tends to stay in
motion unless acted
upon by an outside
force.



Newton’s Second
Law of Motion:
states the
relationship of
pushes, pulls, mass,
and acceleration
this law says: the
acceleration of an
object depends on
the net force acting
on the object and the
mass of the object
NEWTON’S LAWS
CONTINUTED



Newton’s Third Law:
this law states: whenever an object exerts a
force on a second object, the second object
exerts an equal and opposite force on the
first object.
OR for every action there is an equal and
opposite reaction
APPLYING NEWTON’S LAWS

First Law
– The amount of
inertia present in a
lump of matter
depends partly on
size and what the
material is made of.
– A baseball has more
mass than a foam
ball of the same
diameter, and a steel
ball the size of a
baseball has more
mass than both balls.
– the more massive
the object the
more inertia it
has.
APPLYING NEWTON’S LAWS

The Second Law:
– if the mass of an
object does not
change the
acceleration of the
object will increase
when a larger force
is applied.
– If the same amount
of force is exerted on
the objects, then the
acceleration of the
larger mass will be
less.
– Dealing with
momentum: As your
velocity increases
your momentum
increases, therefore
you have more
“Bashing Power”.
APPLYING NEWTON’S LAWS

The Third Law:
– forces always come
in pairs, an action
and a reaction.
– Examples: The force
of a climber on a
rope (down), and the
force of the rope on
the climber (up). (pg.
75)
– The force of the
water pump on
water (forward), and
the force expelled on
the hose (backward).
– AS LONG AS THE
FORCES ARE
BALANCED, AND THE
NET FORCE OF THE
OBJECT IS ZERO,
THEN THE OBJECT
DOES NOT MOVE.
REVIEW:

Know:
– Acceleration, energy, force, momentum,
velocity and mass
– Newton’s Three Laws
– How to apply Newton’s Three Laws
– STUDY, STUDY, STUDY!!!
– Then you should be prepared for your test.