forces a force is a push or a pull on an object. every force has strength, magnitude and direction....
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FORCES
A force is a push or a pull on an object.
Every force has strength, magnitude and
direction.
Forces acting on a stationary object can set
the object in motion.
They can also change the object’s speed or
the direction it is moving in.
Forces can also change the shape of a
stationary object.
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GRAV
ITY Why do things fall to the
ground?Gravity is the force of attraction
between all objects that have
mass.The strength of gravity
between two objects depends
on two things: the mass of the
objects and the distance
between them.
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Ele
ctri
c and
Magneti
c Fo
rces
These forces are closely
related.Both are cause by negative and positive
charges in matter.Electric forces are associated with unmoving charges.
Magnetic forces are created by moving electric chages.
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Fric
tion
-Friction is the force that opposes
motion between two surfaces that
are in contact with each other.
-Friction might prevent motion
from starting, or it might oppose
motion in progress.-Types of friction include sliding,
rolling, static and fluid.
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Bala
nce
d a
nd
Unbala
nce
d F
orc
es
-More than one force can – and
usually does- act on an object at
the same time.-Sometimes these forces are
applied in the same direction.
-Sometimes the forces are applied
in different directions.-The net force on an object is the
combination of all the forces
acting on it.-Force is measured in newtons.
-Force is shown with arrows.
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Bala
nce
d F
orc
es
-When the net force is zero, the
forces are said to be balanced.
Balanced forces produce no
change in the motion of an object.
-An object that is not moving will
stay motionless, while an object
that is moving will maintain its
speed and direction. Balanced
forces can, however, crush an
object.
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Unbala
nce
d
Forc
es
-When the net force on an object is
greater than zero, the forces are
said to be unbalanced.
Unbalanced forces produce a
change in the motion of an object.
- A motionless object will begin to
move, while an object already
moving will change its speed
and/or direction.
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Calc
ula
ting
Net
Forc
e-To find the net force of forces that
are acting in the same direction,
simply add them together.
-to find the net force of forces that
are acting in opposite directions,
simply subtract the smaller force
from the larger one.