Understanding Action at a Distance Forces: Focus on Magnetism
Overview
In this video, we explore the concept of action at a distance forces, particularly magnetism. The discussion includes how magnets can exert forces on each other without physical contact, demonstrating both repulsion and attraction effects. For a deeper understanding of the principles behind these forces, you may want to check out Understanding Magnetism: Forces, Currents, and Magnetic Fields.
Key Points
- Definition of Action at a Distance Forces: These are forces that act between two or more objects that are not in contact.
- Examples of Action at a Distance Forces: Gravity, static electricity, and magnetism. To learn more about the specifics of electric charges and their interactions, refer to Understanding Electric Charges and Forces: A Comprehensive Guide.
- Magnetism Demonstration:
- Repulsion: When two magnets are brought close together, they can repel each other, causing an increase in mass as registered by a scale.
- Attraction: Flipping the magnets can lead to attraction, resulting in a decrease in mass as one magnet lifts the other. For a more detailed exploration of the forces involved, see Understanding Electromagnetism: The Basics of Forces, Mass, and Charge.
- Contact Forces: In contrast, contact forces require physical interaction, as demonstrated by pressing down on a magnet with fingers.
Conclusion
The video concludes with a summary of the differences between action at a distance forces and contact forces, emphasizing the fascinating nature of magnetism. For those interested in a broader context, including optics and quantum mechanics, check out Understanding Electromagnetism, Optics, and Quantum Mechanics in Physics.
[Music] good morning today we'll be talking about a type of
force called action at a distance now force is any push or pull and an action at a distance force is a type of
force between two or more objects that are not in contact with each other a few moments ago i showed you luke
skywalker lifting objects without physically touching them he was using an action at
a distance force other types of action at a distance
forces include gravity stack electricity and magnetism now today i'm going to focus on
magnetism let's watch the video i'm going to pause the video now and notice that as the two
magnets get closer to each other they are exerting a force on each other even though they're not in contact in
fact these magnets are repelling each other this is the reason why the mass
as registered by the scale is increasing this magnet here is pushing this magnet down
they are repelling each other causing the mass to increase again this is action at a distance
because these magnets are not in contact with each other at this point i literally could feel
that force in my hand i felt a force acting upwards on the magnets i held in my hand
again even though i'm not touching the magnets there is still a force
now by flipping the magnets around we can achieve the opposite effect in a moment i'm going to show you
when the magnets attract each other the mass as registered by the scale actually
decreases let's take a look now the magnets are attracting
and so in this situation this magnet is lifting that magnet upwards and the mass as registered by the scale
is decreasing because of that upward lifting force now the aerotype of force i want to talk
about is a contact force as the name implies you come into contact with the object
so here i'm going to use my fingers to press down on the magnet and you'll see this mass increase and
then after i'll lift up on the magnet and the mass will decrease
this is exactly the same thing i was doing with the other magnet except now i'm using my fingers
greater mass and now lighter mass when lifting i hope you enjoyed today's videos have a
great day bye
Action at a distance forces are forces that can act between two or more objects without them being in physical contact. Examples include gravity, static electricity, and magnetism.
Magnets can exert forces on each other without touching. They can either repel or attract each other depending on their orientation. This phenomenon illustrates the concept of action at a distance.
Repulsion occurs when like poles of two magnets face each other, causing them to push away. Attraction happens when opposite poles face each other, resulting in one magnet pulling the other closer.
Contact forces require physical interaction between objects, such as pressing down on a magnet. In contrast, action at a distance forces operate without any physical contact.
Yes, other examples of action at a distance forces include gravitational forces, which act between masses, and electrostatic forces, which act between charged particles.
For a deeper understanding of magnetism, you can check out related videos such as 'Understanding Magnetism: Forces, Currents, and Magnetic Fields' and 'Understanding Electromagnetism: The Basics of Forces, Mass, and Charge'.
Understanding action at a distance forces is crucial in physics as it helps explain fundamental interactions in nature, influencing various fields such as electromagnetism, gravity, and quantum mechanics.
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