Sir Isaac Newton discovered the three laws of motion that describe how objects move. The first law states that objects at rest will stay at rest and objects in motion will stay in motion with the same speed and direction unless acted upon by an unbalanced force. The second law states that force equals mass times acceleration. The third law states that for every action there is an equal and opposite reaction.
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This Document contains basic knowledge about Newtons Laws Of Motion with its application in real world.
It Also contains some of the examples and its working.
Newton's First Law of Motion: I. Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it. This we recognize as essentially Galileo's concept of inertia, and this is often termed simply the "Law of Inertia".
Unit 8 - Information and Communication Technology (Paper I).pdfThiyagu K
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2. Background
Sir Isaac Newton (1642-1727) an English
scientist and mathematician famous for his
discovery of the law of gravity also
discovered the three laws of motion. Today
these laws are known as Newton’s Laws of
Motion and describe the motion of all
objects on the scale we experience in our
everyday lives.
3. Newton’s Laws of Motion
1. A body tends to be in it’s state of rest
or uniform motion,unless an
unbalanced external force act upon it
2. Force equals mass times acceleration
(F = ma)/the rate of change of
momentum is directly proportional to
the applied force
3. For every action there is an equal
and opposite reaction.
4. Newton’s First Law
A body tends to be in it’s state of rest or
uniform motion,unless an unbalanced
external force act upon it
5. What does this mean?
Basically
If the object was sitting still, it will remain
stationary. If it was moving at a constant
velocity, it will keep moving.
It takes force to change the motion of an
object.
6. What is meant by unbalanced
force?
If the forces on an object are equal and opposite, they are said
to be balanced, and the object experiences no change in
motion. If they are not equal and opposite, then the forces are
unbalanced and the motion of the object changes.
7. Some Examples from Real Life
Two teams are playing tug of war. They are both
exerting equal force on the rope in opposite
directions. This balanced force results in no
change of motion.
A soccer ball is sitting at rest. It
takes an unbalanced force of a kick
to change its motion.
8. Newton’s First Law is also called
the Law of Inertia
Inertia: the tendency of an object to
resist changes in its state of motion
The First Law states that all objects
have inertia. The more mass an object
has, the more inertia it has (and the
harder it is to change its motion).
9. If objects in motion tend to stay in motion,
why don’t moving objects keep moving
forever?
Things don’t keep moving forever because
there’s almost always an unbalanced force
acting upon it.
A book sliding across a table slows
down and stops because of the force
of friction.
If you throw a ball upwards it will
eventually slow down and fall
because of the force of gravity.
10. In outer space, away from gravity and any
sources of friction, a rocket ship launched
with a certain speed and direction would
keep going in that same direction and at that
same speed forever.
11. Newton’s Second Law
Force equals mass times acceleration.
F = ma
Acceleration: a measurement of how quickly an
object is changing speed.
12. What does F = ma mean?
Force is directly proportional to mass and acceleration.
Imagine a ball of a certain mass moving at a certain
acceleration. This ball has a certain force.
Now imagine we make the ball twice as big (double the
mass) but keep the acceleration constant. F = ma says
that this new ball has twice the force of the old ball.
Now imagine the original ball moving at twice the
original acceleration. F = ma says that the ball will
again have twice the force of the ball at the original
acceleration.
13. More about F = ma
If you double the mass, you double the force. If you
double the acceleration, you double the force.
What if you double the mass and the acceleration?
(2m)(2a) = 4F
Doubling the mass and the acceleration quadruples the
force.
So . . . what if you decrease the mass by half? How
much force would the object have now?
14. What does F = ma say?
F = ma basically means that the force of an object
comes from its mass and its acceleration.
Something very small (low mass) that’s
changing speed very quickly (high
acceleration), like a bullet, can still
have a great force. Something very
small changing speed very slowly will
have a very weak force.
Something very massive (high mass)
that’s changing speed very slowly (low
acceleration), like a glacier, can still
have great force.
16. What does this mean?
For every force acting on an object, there is an equal
force acting in the opposite direction. Right now,
gravity is pulling you down in your seat, but
Newton’s Third Law says your seat is pushing up
against you with equal force. This is why you are
not moving. There is a balanced force acting on
you– gravity pulling down, your seat pushing up.
17. Think about it . . .
• Reaction from wall
• On boat
• A hit
• Quick sand
18. Review
Newton’s First Law:
A body tends to be in it’s state of rest or uniform
motion , unless an unbalanced external force act
upon it
Newton’s Second Law:
Force equals mass times acceleration
(F = ma).
Newton’s Third Law:
For every action there is an equal and
opposite reaction.
19. Vocabulary
Inertia:
the tendency of an object to resist changes
in its state of motion
Acceleration:
•a change in velocity
•a measurement of how quickly an object is
changing speed, direction or both
Velocity:
The rate of change of a position along
a straight line with respect to time
Force:
strength