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Newton's Law

Newton's 3 Laws of Motion explain and investigate the motion of physical objects and systems. The first law states that an object at rest stays at rest and an object in motion stays in motion unless acted upon by an unbalanced force. The second law states that the acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force and inversely proportional to the object's mass. The third law states that for every action force there is an equal and opposite reaction force.

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Kyla Desiree Bedienes
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44 views10 pages

Newton's Law

Newton's 3 Laws of Motion explain and investigate the motion of physical objects and systems. The first law states that an object at rest stays at rest and an object in motion stays in motion unless acted upon by an unbalanced force. The second law states that the acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force and inversely proportional to the object's mass. The third law states that for every action force there is an equal and opposite reaction force.

Uploaded by

Kyla Desiree Bedienes
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Newton’s 3 Laws of

MOTION
 NEWTON USED THEM TO EXPLAIN AND INVESTIGATE
THE MOTION OF MANY PHYSICAL OBJECTS AND SYSTEMS.
Newton’s First Law of Motion
An object at rest tends to stay at
rest and an object in motion
tends to stay in motion unless
acted upon by an unbalanced
force.
INERTIA
 Termused to measure the ability or property of an
object to resist damage in its state of motion.
 The
tendency of an object to keep on doing
whatever it is doing.
 Came from latin word “inertus” which means lazy.
The first law can be stated mathematically
when the mass is a non-zero constant, as,

Consequently,
 An object that is at rest will stay at rest unless a force acts
upon it.
 An object that is in motion will not change its velocity unless
a force acts upon it.
NEWTON’S SECOND LAW OF MOTION
 Whenever a resultant force acts on an object it
produces an acceleration that is directly proportional
to the mass.
 Thedirection of the acceleration is in the direction of
the net force acting on the object.
WEIGHT – force due to gravity. It is
directed downward and it varies from
location to location.
MASS – universal constant which is a
measure of the inertia of a body.

F = ma
20 N force moves a body with an acceleration of
2m/s².What is its mass?
Data:
Force= F= 20 N
acceleration =a=2m/s.s
Mass=m=?
Solution:
Formula: F =ma
m= F/a
m=20N/2ms‾²
m=10 kg
2. A 1 kg object accelerated at a constant 5 m/s2.
Estimate the net force needed to accelerate the
object.
Known :
Mass (m) = 1 kg
Acceleration (a) = 5 m/s2
Wanted : net force (∑F)
Solution :
We use Newton’s second law to get the net force.
∑F = m a
∑F = (1 kg)(5 m/s2) = 5 kg m/s2 = 5 Newton
Newton’s Third Law of Motion
 For every object there is an equal and opposite
reaction.
 All forces come in pairs.
 Action and reaction forces act on different objects,
not on the same object.
 The forces cannot cancel because they act on
different objects.
 When one body exerts a force on a
second body, the second body
simultaneously exerts a force equal in
magnitude and opposite in direction
on the first body.

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