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Newton's Three Laws of Motion

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Alicia Siddons

on 24 October 2012

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Transcript of Newton's Three Laws of Motion

By Alicia Siddons Newton's Three Laws of Motion Newton's First Law of Motion Newton's Second Law of Motion Newton's Third Law of Motion Now we've covered all three of Isaac Newton's laws. Isaac Newton's first law of motion, also known as the law of inertia states: The first of the three laws explains how an unbalanced force must act upon an object in order for it to change it's state of motion. This is because all objects have inertia which is their tendency to resist a change in motion. Friction and gravity are examples of acting forces.
The second law then shows that the amount of force required to accelerate an object depends on the object's mass and acceleration. This law also explains the occurrence relating to the third law which states that two interacting objects exert equal and opposite forces which come in action and reaction pairs.
An object at rest shall stay at
rest, and an object in motion will stay
in motion at a constant velocity,
unless acted upon by an
unbalanced force. This means... Friction is an ubiquitous force that acts against any object in motion. It occurs when two objects make contact. Take a look at the video. The orange's acceleration is decreasing before it even hits the wall. This is due to friction. Well, what is inertia?
Inertia is an object's tendency to resist a change in motion. Watch the video to view the demonstration. Objects shall remain in their current state of motion
unless they are compelled by an external force. Both the hand lifting the apple and the wall blocking the orange are acting external forces. However, there is yet another force: friction. Unbalanced Force Gravity inertia air resistance Let's take a look at all the forces applied.. But why is Newton's first law also known as the law of inertia? Force (F) = Mass (m) x Acceleration (A) The relationship
between an object's mass, acceleration, and the applied force can be expressed with force equals mass times acceleration.
(f=ma) Likewise,
the greater the net force
applied to an object with a constant
mass, the greater the acceleration.
This can be observed in the video below: (cc) photo by medhead on Flickr In
other words,
when an object
is influenced by
an external force, the
object's acceleration is
dependent on the object's
mass and the net force applied.


For this reason,
more force is required to accelerate an object
with a greater mass to equal that of a lighter object. For every action,
there is an equal and opposite re-action. Newton's
third law
explains that forces
acting upon two intersecting objects come
in equal and opposite action-reaction pairs. Thus, when an object exerts a force
on another object, the second object applies an
equal force on the first in the opposite direction. If the darker ball this second ball, The second would place the same amount of force against the darker ball towards the other direction. Since the balls have equal masses,
their acceleration is equal as they bounce off in opposite directions. But what if the two objects do not have the same mass?
Watch the video to see how a horse creates motion. horse pushes backwards ground pushes forwards gravity action force reaction force horse accelerates forwards ground accelerates backwards force accelerates
the small bottle smaller mass less force required gravity force accelerates
the larger bottles greater mass more force required were to hit Let's clarify the acting forces. Now you know Newton's first law of motion. Why don't we move onto the second law. Now we've covered Newton's second law of motion, it's time to move onto the third law. So if you've ever heard the expressions, "It disappeared like magic!" or, "It grew legs and ran away!" you now understand why these forces, though unreal, would be required to influence an object's motion. You also know why heavier objects are more difficult to lift than others,and understand how we are able to propel ourselves forward by pushing against an object in the opposite direction. Thank you for viewing this Presentation! Many thanks to my brother Harry and my cousins Joshua and Lawrence for featuring in the films and pictures. Thank you also to my lovely horse riding teacher, Marta, and her new husband for filming me riding. And thank you most of all to my wonderful horse, Fair Play, who happened to choose the worst day to be lazy. Other citations:
Sir Isaac Newton.Photography.Encyclopædia Britannica Image Quest.Web. 21 Oct 2012. http://quest.eb.com/images/139_1986492
Isaac Newton.Photography.Encyclopædia Britannica Image Quest.Web. 22 Oct 2012.http://quest.eb.com/images/132_1256211
Sir Isaac Newton.Fine Art.Encyclopædia Britannica Image Quest.Web. 22 Oct 2012.http://quest.eb.com/images/114_1751660Ball. N.d. Photograph.Basketball 101. By Kamau King. Blogspot, 31 Aug. 2012. Web. 23 Oct. 2012.Watson, J.Basketball. 2012. Photograph.Tampa Bay Seminole Club. 27 Jan. 2012. Web. 23 Oct. 2012
Season and Sun Moon Stars. Digital image.Sign Specialist. N.p., n.d. Web. 23 Oct. 2012.
Gardener, Majority. "Walk a Book." Cartoon.Walk-a-Book. Blogspot, 16 July 2012. Web. 23 Oct. 2012.
Kidsclipart. "Flying Fairy Princess Magic Wand Cut Out." Cartoon.Zazzle. N.p., 17 Feb. 2012. Web. 23 Oct. 2012.




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