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17 votes
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Why does a charge need to have a velocity to experience force in a magnetic field?

The question "why?" in Physics may have different answers, depending on the depth one wants and is able to dig. Lorentz force and the development of special relativity So, assuming you know ...
basics's user avatar
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4 votes
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Should a box on a surface have an even number of forces?

When you do a free body diagram, you should focus only on forces and moments acting on the system of your interest. As an example, if you're studying the equilibrium of the box, you should only draw ...
basics's user avatar
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4 votes
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What happens when we apply the exact same pulling force as bonding force of glue?

Your problem may seem as a genuine mechanics problem at first, but it's not. We could formulate it in equivalent ways, such as "what happens if a tub can only be filled with 20 litres of water, ...
Lagrangiano's user avatar
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3 votes

Where is the reaction force $F_2$ of $F_1$ applied?

Whenever in doubt, think fundamentally at a basic level. Clearly define the system that you are applying forces on. Case 1: Here the force on the escaping gas is applied by System 2. So, if system 2 ...
EagerToLearn's user avatar
3 votes

Does a rubber mat reduce the impact to the floor below?

If dropped, the falling barbell will carry a considerable amount of kinetic energy when it hits the floor. Preventing damage to the floor involves managing that impact energy. Here is how to do it: A ...
niels nielsen's user avatar
3 votes

Why does a charge need to have a velocity to experience force in a magnetic field?

If there is a field force, then it can do work on a particle that is being affected by the field. Therefore, the energy corresponding to the work done is stored or removed from the field between the ...
EagerToLearn's user avatar
3 votes

Is it necessary that a particle attains terminal velocity?

In a simplified model such at drag being proportional to the speed $v$ or the squared speed $v^2$ the speed never reaches terminal velocity in general. Rather, it approaches the terminal velocity as $...
BioPhysicist's user avatar
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2 votes

How does $g$-force work?

"G-Force" is a colloquial term. However, it is indeed a very common one. G-forces show up most commonly in systems where one is constrained to accelerate at a certain rate (although you ...
Cort Ammon's user avatar
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2 votes

Why does a charge need to have a velocity to experience force in a magnetic field?

a charged particle must be in motion to experience a force in this magnetic field. This is not entirely true; a macroscopic charged particle may experience force in purely magnetic field, even when ...
Ján Lalinský's user avatar
1 vote

How does a snake climb the wall?

I used to keep a range of reptiles when I was younger with the goal of becoming a herpetologist. Snakes possess unique scales on their bellies known as scutes, which aid in gripping surfaces like the ...
007's user avatar
  • 111
1 vote
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What exactly is the normal force?

If Mr. B's mass is half of Mr. A's mass, then the normal force must be adjusted to half, and Mr. B will also perform the same circular motion as Mr. A. The gravitational force and the centripetal ...
KDP's user avatar
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1 vote

Does the distance between two objects of mass not matter when measuring strength of gravity in one-dimensional space?

Yes, for the Newtonian version of gravity (a field is sourced from mass, i.e: $$ \vec \nabla \cdot \vec F_G \propto \rho $$ which in one dimension reads: $$ \frac{dF}{dx} = \rho $$ For a point source: ...
JEB's user avatar
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1 vote

Should a box on a surface have an even number of forces?

As @basics already answered, the diagram is missing the equal and opposite force $W$ acting on the earth by the box. But this omission is not in error, but rather a convenience as the motion of the ...
John Alexiou's user avatar
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1 vote

Should a box on a surface have an even number of forces?

First off, number of forces is a vague term. You can break a force like 10N into two smaller force of 5N. For example number of forces between a block and table is infinite and is distributed all over ...
EagerToLearn's user avatar
1 vote

Why does a charge need to have a velocity to experience force in a magnetic field?

I could answer your question with a lot of demonstrations or formulas, but I think it is much more intuitive to say that the formula describes the world we live in. If the particle has to be in motion ...
JL14's user avatar
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1 vote
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What are the acting forces in the tug of war problem?

In the game of tug and war all the forces between persons 1 and 2 and the rope are internal forces, being equal and opposite per Newton's third. Call all these force $F$. See FIG 1. But the internal ...
Bob D's user avatar
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1 vote

What are the acting forces in the tug of war problem?

If there is no friction between the surface and the person, pulling the rope will simply cause the person to accelerate forward. If two persons are pulling the rope, The two people will accelerate ...
EagerToLearn's user avatar

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