Transcript go up, go down, push me, and throw me away

GO UP, GO DOWN, PUSH
ME, AND THROW ME AWAY
5-5.1 Illustrate the effects of force (including
magnetism, gravity, and friction) on motion.
Alfonso Landa
MOVEMENT
In our world it is
possible to see that
things, animals, people…
are moving.
How can we know that
something is moving?
Something is moving
because it is changing
from one position to
another over time.
But why is it moving?
What makes it moving?
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©pro.corvis.com
FORCES
What make something move is the force.
Force is any push of pull from one object
to another. Some forces occur when one
force touches another, such as a leg
kicking a ball. Other forces, though, may
act without object touching as a compass
needle.
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EFECTS OF FORCE
There are different effects of forces. They
can:
push or pull things forward (thrust)
rise objects (lift)
slow down the object or pull back,
pull down.
can crush,
stretch
Twist objects and deform them.
DIFFERENT FORCES
There are different forces that make things move:
An engine
Gravity
An animal
Magnetism
Natural forces
Friction
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GRAVITY
What goes up, must come down
Gravity depends on their masses of the
objects and the distance between them.
Increasing the mass increases the force,
and increasing the distance decreases the
force.
Every object in the universe is
pulling on every other object
because it has mass (Newton’s Law
of Universal Gravitation).
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FRICTION
Friction is a force that opposes the motion
of one object moving past another. Friction
makes difficult to slide on rough surfaces.
Friction depends on:
 The surfaces
 How hard the objects are pushed
together.
To reduce friction we use
lubricants
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MAGNETISM
Magnetism is the
ability of an object to
push of pull on
another object that
has the magnetic
property (iron,
nickel).
Magnets have two
poles: north (N) and
south (S), Like poles
repel one another;
different poles attract.
www.howstuffworks.com/compass.htm
INERTIA
Inertia is that an object at rest tends to
stay at rest, and an object in constant
motion tends to stay in motion, unless
acted upon by an unbalanced forces.
(Newton’s First Law)
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 Balance forces are forces that act on an object
without changing its motion. The forces acting on
stationary objects are always balanced.
 A force that causes an object to change its motion
is called an unbalanced force.
FORCE, MASS AND
ACCELERATION
The unbalanced force on an object
is equal to the mass of the object
multiplied by its acceleration: F=
m x a. (Newton’s Second Law)
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Something that is accelerating, changing its
speed, is because an unbalance force is acting in it.
Acceleration decreases as mass increases as long
as force is no changing.
ACTION REACTION
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All forces occur in pairs, and
these two forces are equal in
strength and opposite in
direction. (Newton's Third
Law)
When one object pushes on a second object, the
second pushes back on the first with the same
strength.
When a person sits on a chair, the weight is
pushing down on the chair. A reaction force from
the chair pushes back up on the person.