# Newtons Laws

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```					Newton’s Laws
of
Motion
Explain the
First Law of Motion
Explain the First Law of Motion
• An object will not change its motion
unless a force acts on it.
• An object that is not moving remains at
rest until something pushes or pulls it.
• An object that is moving remains
moving until something pushes or pulls
it.
Explain the First Law of Motion
• The force that causes objects to slow
down is FRICTION.
• Friction always acts opposite to the
direction of motion.
• To keep an object moving when
friction is acting on it, you have to
keep pushing or pulling on the object
to overcome the frictional force.
Explain the First Law of Motion
• All objects resist having their motion
changed.
• This tendency to resist a change in
motion is called inertia.
• The more mass an object has, the
greater its inertia.
See Examples of the 1st Law of
Motion Here:

f/newton/first/index.html
Review the First Law here:

http://www.usoe.k12.ut.us/curr/scien
ce/sciber00/8th/forces/sciber/newto
ns.htm
Newton’s First Law of Motion
may be found here:
http://www.beyondbooks.com/psc91
/4a.asp
Explain the
Second Law of Motion
Explain the Second Law of Motion

• A change in motion occurs only if a
net force is exerted on an object.
• A net force changes the velocity of the
object, and causes it to accelerate.
Explain the Second Law of Motion
• If an object is acted upon by a net force, the
change in velocity will be in the direction of
the net force.
• Acceleration can be calculated from the
formula:
Explain the Second Law of Motion
• The acceleration of an object depends
on its mass.
• The more mass an object has or the
more inertia it has, the harder it is to
accelerate.
• More mass means less acceleration if the
force acting on the objects is the same.
Explain the Second Law of Motion
• If a stands for the acceleration, Fnet for the
net force, and m for the mass, this formula
can be written as follows:

• In this formula the force is in newtons, the
mass is in kilograms, and the acceleration is
in meters per second squared.
See Examples of the 2nd Law of
Motion Here:

f/newton/second/index.html
Review the Second Law here:

http://www.usoe.k12.ut.us/curr/scien
ce/sciber00/8th/forces/sciber/newto
n2.htm
Second Law of Motion may be
found here:

http://www.beyondbooks.com/psc91
/4d.asp
Explain the
Third Law of Motion
Explain the Third Law of Motion
• When one object exerts a force on a
second object, the second object exerts
an equal force in the opposite direction
on the first object.
• The force exerted by the first object is
the action force.
• The force exerted by the second object
is the reaction force.
See Examples of the 3rd Law of
Motion Here:

f/newton/third/index.html
Review the Third Law here:

http://www.usoe.k12.ut.us/curr/scien
ce/sciber00/8th/forces/sciber/newto
n3.htm
Newton’s Third Law of Motion
may be found here:

http://www.beyondbooks.com/psc91
/4f.asp

```
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