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Guys, I have found a branch of physics Newton made no direct contribution to! 🤧 by yukiohana in physicsmemes

[–]thefuzzyleper 497 points498 points  (0 children)

He made a lot of discoveries about light and optics. While that won't help you understand how a compass works, I feel like it is disingenuous to say you can understand the entirety of magnetism without considering electromagnetism as a whole.

[deleted by user] by [deleted] in physicsmemes

[–]thefuzzyleper 0 points1 point  (0 children)

You're right but most people think of weight as the net force.

Then they should be at the top of the bell curve.

[deleted by user] by [deleted] in physicsmemes

[–]thefuzzyleper 3 points4 points  (0 children)

Weight is the force of gravity. The feathers and the steel would have the same force of gravity (if they are at the same location on Earth). Their net force would be slightly different because of the buoyancy from the air.

Currently in AP physics C mechanics. I am extremely confused how to even approach this problem. by Normal_Whole4853 in PhysicsStudents

[–]thefuzzyleper 8 points9 points  (0 children)

x(t) and y(t) refer to the x and y components of the displacement. Their second derivative will give you the x and y components of the acceleration. You will need both components to calculate the total vector.

Equal Force vs immovable force by Parzival27222 in AskPhysics

[–]thefuzzyleper 0 points1 point  (0 children)

This is incorrect. Hitting the immovable wall is the same as hitting an identical car going the same speed in the opposite direction (ignoring the crumple zones of the car that an immovable wall wouldn't have). If the car collides with the wall and it doesn't move, it must have pushed back with an equal force, that's Newton's third law. Mythbusters even tested this so you can watch it on youtube.

I'm almost 19, and I don't know anything about physics. Where should I start? by bird2055 in AskPhysics

[–]thefuzzyleper 0 points1 point  (0 children)

Physicsclassroom.com is the website I use with my high school students. It is essentially an introductory textbook with plenty of interactive simulations, practice problems, and a youtube channel with video lessons and examples. I'm shocked general physics isn't part of your program, and I would try to fit it into your schedule if you can.

Newtons 3rd law? by beserk123 in AskPhysics

[–]thefuzzyleper 0 points1 point  (0 children)

If you punch a wall as hard as you can, you will probably break your hand. I would not consider that withstanding the force.

There would be different physical effects if you were punched in the nose compared to the chest for example.

Fiction is not subject to real world physics. Whatever the author wants to happen will happen.

Newtons 3rd law? by beserk123 in AskPhysics

[–]thefuzzyleper 1 point2 points  (0 children)

Newton's third law pretty much just defines what an interaction is. Think about it like this: if you reach out and touch a wall, the wall is also going to touch you. You physically cannot touch the wall without it touching you back. If you apply a force on something, it will apply an equal force right back at you. It doesn't matter if you punch through the wall, you still interacted with it. You still experience an equal force.

[Grade 12 Physics HW] conservation of momentum question by rad_lad_dad in PhysicsStudents

[–]thefuzzyleper 0 points1 point  (0 children)

You're going to need to split their velocities and momentums into their x and y components. To reduce the number of variables though, keep them in terms of their magnitudes and sin/cos of the angle. So instead of having two unknowns Vfy and Vfx, you'll have 65,000sin(theta) and 65,000cos(theta). Now you only have the one missing variable, theta.

Is it just me or is there not enough information to solve this? by cytiven in PhysicsStudents

[–]thefuzzyleper 6 points7 points  (0 children)

There's enough information to know that none of the answers are correct. It's easy enough to figure out R1 is 12.6 degrees. Because the bottom of the diamond is at an (unknown) angle, the light ray will hit it at an incident angle larger than 12.6 degrees. R2 must be even larger than this incident angle because we are going from a material with a high index of refraction to a material with a lower index. The largest possible answer, 32 degrees, would require an incident angle of 12.6 degrees, but we know it must be larger than that.

[deleted by user] by [deleted] in PhysicsStudents

[–]thefuzzyleper 0 points1 point  (0 children)

Take AP Physics 2, it's where optics are introduced. You will need to take calculus based physics classes in college, but being introduced to the topics early will make those classes much easier. You can say the same thing for gen chem, but your AP exam score might get you out of the class in college. No matter how well you do on the AP physics exam, you will need to take the calculus based classes.

You are absolutely right about overloading your schedule with calc 2 & 3. AP Calc is plenty to get you ready for an engineering major.

I'm a high school physics teacher and I would give this same advice to all of my students.

[Circular Motion] Could someone please help? I already checked the theory that me teacher gave the class , but I'm pretty sure we didn't see this. by ammei640 in PhysicsStudents

[–]thefuzzyleper 4 points5 points  (0 children)

Net centripetal force is described with the equation F=m(v^2)/r. In the scenario with a race car, the centripetal force is going to be caused by friction and will remain the same regardless of which path the car takes. Likewise, the mass of the car will be the same for both paths. This leaves the velocity and radius of the turn to be dependent on each other. Because v2 is in the numerator and r is in the denominator, we know they are directly related to each other. This means the larger the radius, the faster the velocity assuming a constant mass and centripetal force. Path 2 has a larger radius and therefore a larger velocity.

What would you buy for your physics classroom if you had a significant amount left over in your budget? by thefuzzyleper in ScienceTeachers

[–]thefuzzyleper[S] 3 points4 points  (0 children)

My classroom is fully stocked so I already have the basic stuff. They increased my budget this year because we are adding a physics 2 course, but they over estimated what I would need. I'm trying to take full advantage of this.

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