What is Newton's Third Law of Motion | Action and Reaction Forces with Examples | Dr. Binocs Show
Summary
TLDRThis educational video explores Newton's Third Law of Motion, which states that for every action, there is an equal and opposite reaction. It uses relatable examples like sitting on a chair and a bird flapping its wings to explain how forces interact. The video also touches on how mass and acceleration affect these forces, using the example of a gun's recoil when firing a bullet. It concludes with a historical note on Newton's publication of the laws of motion and a trivia question, making the content both informative and engaging.
Takeaways
- 🔍 Newton's third law of motion states that for every action, there is an equal and opposite reaction.
- 🧐 The law helps us understand how forces interact in the physical world, such as when you push against something, it pushes back with equal force.
- 💺 Examples include sitting on a chair, where the action force is your body's weight and the reaction force is the chair's support.
- 🐦 Forces can be contact forces like friction or non-contact forces like gravity, as illustrated by a bird flapping its wings.
- 🎯 Action and reaction forces are equal in magnitude but opposite in direction, balancing each other out.
- 🚀 The recoil of a gun when firing a bullet is an example of Newton's third law, where the bullet and gun exert equal and opposite forces.
- 🤔 The effect of forces on an object depends on its mass and acceleration, as explained by Newton's second law.
- 🚢 The mass of an object affects how it reacts to forces; a heavy ship will move less than a small boat when pushed with the same force.
- 📚 Newton's laws of motion were first published in 1687 in his book 'Mathematical Principles of Natural Philosophy'.
- 🎨 The sketch of the day was provided by Amaya Rajput, highlighting the educational content of the video.
Q & A
What is Newton's third law of motion?
-Newton's third law of motion states that for every action, there is an equal and opposite reaction. This means that whenever a force is applied to an object, the object applies a force back that is equal in magnitude but opposite in direction.
How does the action-reaction force pair relate to the concept of forces in physics?
-In physics, forces are pushes or pulls that occur during the interaction of objects. The action-reaction force pair is a direct manifestation of this concept, where the action force is the initial force applied, and the reaction force is the equal and opposite force exerted by the second object.
Why do we need to understand Newton's first and second laws before diving into the third law?
-Understanding Newton's first and second laws provides a foundational context for the third law. The first law (inertia) and the second law (force equals mass times acceleration) help explain how objects resist changes in motion and how acceleration is affected by force and mass, which are key to understanding the interaction of action and reaction forces.
Can you give an example of action and reaction forces in everyday life?
-Yes, when you sit on a chair, your body exerts a downward force (action) due to gravity, and the chair exerts an equal and opposite upward force (reaction) to support you, preventing you from falling through it.
What are the two main types of forces mentioned in the script?
-The two main types of forces mentioned are contact forces, such as friction, and non-contact forces, such as gravity.
How does the mass of an object affect its reaction to forces?
-The reaction of an object to forces depends on its mass and the amount of acceleration it experiences. According to Newton's second law, heavier objects will accelerate less for the same force applied compared to lighter objects.
Why doesn't the gun fly back as fast as the bullet when fired?
-The gun doesn't fly back as fast as the bullet because it has a much greater mass. According to Newton's second law, the acceleration of an object is directly proportional to the net force acting upon it and inversely proportional to its mass. Thus, the gun's larger mass results in a smaller acceleration and less recoil.
What happens when you jump out of a boat onto the shore?
-When you jump out of a boat onto the shore, you push the boat backward (action), and the boat pushes you forward (reaction), helping you reach the shore. The boat, being less massive compared to you, moves away due to the applied force.
Why does pushing a huge ship have a minimal effect compared to pushing a small boat?
-Pushing a huge ship has a minimal effect because the ship's mass is significantly larger than your own, and the force you apply has a negligible impact on its movement. This results in almost no movement of the ship, while you still experience the reaction force that propels you forward.
Who first stated the three laws of motion and in what year were they published?
-The three laws of motion were first stated by Sir Isaac Newton in his book 'Mathematical Principles of Natural Philosophy,' which was originally published in 1687.
What is the significance of today's sketch of the day mentioned in the script?
-Today's sketch of the day is significant as it represents a visual summary or interpretation of the discussed concept, in this case, Newton's third law of motion, and is credited to Amaya Rajput.
Outlines
🔧 Newton's Third Law of Motion
This paragraph introduces Newton's Third Law of Motion, which states that for every action, there is an equal and opposite reaction. It explains that when a force is applied to an object, the object applies an equal force in the opposite direction. The paragraph uses examples such as sitting on a chair and a bird flapping its wings to illustrate action and reaction forces. It also touches on the concepts of contact and non-contact forces, and how mass and acceleration affect the outcome of these forces. The example of shooting a bullet is used to explain the recoil of the gun due to the bullet pushing back. The paragraph concludes with a trivia note about Isaac Newton and his publication of the laws of motion.
🎥 Dr. Boox's Sign-off
The second paragraph is a brief sign-off from Dr. Boox, the host of the video, indicating the end of the educational segment. It is a casual and friendly closing, with a playful 'zooming out' reference, suggesting the video is coming to an end. The paragraph also includes a light-hearted moment with 'never mind,' possibly indicating a minor on-screen mishap or a humorous aside.
Mindmap
Keywords
💡Newton's Third Law of Motion
💡Action and Reaction Forces
💡Force
💡Contact Forces
💡Non-Contact Forces
💡Mass
💡Acceleration
💡Recoil
💡Balanced Forces
💡Isaac Newton
Highlights
Newton's third law of motion is introduced as a key concept in physics.
The law states that for every action, there is an equal and opposite reaction.
Action and reaction forces are equal in strength but opposite in direction.
An example of action and reaction is sitting on a chair, where gravity pushes down and the chair pushes up.
Forces are categorized into contact forces like friction and non-contact forces like gravity.
A bird flapping its wings demonstrates action and reaction forces in flight.
The reaction of an object to forces depends on its mass and acceleration.
The gun's recoil when shooting a bullet is explained by Newton's third law.
Newton's second law is mentioned to explain why the gun doesn't fly back as fast as the bullet.
Jumping out of a boat onto the shore is used as an example of action and reaction forces.
The mass difference between a person and a ship is highlighted in the context of action and reaction forces.
Isaac Newton's book 'Mathematical Principles of Natural Philosophy' is mentioned as the source of the laws of motion.
The sketch of the day is awarded to Amaya Rajput.
The importance of learning from the laws of motion is emphasized.
The video ends with a teaser for the next topic.
Transcripts
[Music]
oh are you okay little kitty
[Music]
no well the harder you throw the ball
the harder it will hit you back why
that's the nature of physics we learn
about it by answering ing a bouncy
question what is Newton's third law of
motion zoom in before we jump into
Newton's third law I recommend checking
out the first two laws to get a better
understanding you can find the links in
the description below now let's dive
into today's
topic Newton's third law of motion is a
key Concept in physics and it really
helps us understand how things work in
the world the law says for every action
there is an equal and opposite
reaction but what does that really
mean simply put whenever you apply Force
to something that thing pushes or pulls
back with the same amount of force just
in the opposite direction action and
reaction forces
always come as a pair they are equal in
strength but opposite in
direction for instance when you sit on a
chair your body pushes down on the chair
because of gravity that's the action
force the chain turn pushes up with an
equal force the reaction force keeping
you from falling through it the reason
you stay seated is that these forces
balance each other out I bet you're
wondering what exactly are these forces
we're talking about well a force is
basically a push or pull that happens
when two objects interact forces come in
two main types contact forces like
friction and non-c contct forces like
gravity take a bird flapping its wings
for example when it pushes air downward
that's the action force the air pushes
back up on the bird that's the reaction
force lifting it off the ground every
wing flap is a tiny action reaction
event that keeps the bird
flying but here's where it gets
interesting how an object reacts to
these forces depends on its mass and how
much it accelerates Ates think about
shooting a bullet the gun pushes the
bullet forward action and the bullet
pushes back on the gun reaction making
the gun
recoil now you might ask why doesn't the
gun fly back as fast as the bullet
that's because of Newton's Second Law
which tells us that acceleration depends
on an object's mass and the force
applied to it the gun is much heavier
than the bullet so it doesn't accelerate
as much resulting in a small Kickback
instead of sending you
flying here's another example imagine
you're jumping out of a small boat onto
the shore when you push the boat
backward that's the action the boat
pushes you forward that's the reaction
helping you reach the shore while the
boat drifts away but what if you tried
the same with a huge ship instead of a
small boat even though you're still
pushing and the ship is still pushing
back the ship hardly moves why because
the ship's mass is so much bigger than
yours the force you apply barely affects
it so while you move forward the ship
stays fo with almost no movement at all
trivia time did you know the three laws
of motion were first stated by Isaac
Newton in his book mathematical
principles of natural
philosophy yes it was originally
published in
1687 sketching time today's sketch of
the day goes to Amaya
rajput hope you learned something
important today until next time it's me
Dr boox zooming
[Music]
out never mind
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