# FizziksGuy

2,758

47

1. ## People Never Believed The Earth Was Flat, Until Now

My goodness, not sure where to begin here HegelBot153... laughing over the blatant shilling for the APC Companion.
2. ## AP Physics 1 Momentum Supplemental Problem 7b

Hi Maren, The positive/negative impulse implies direction. By Newton's 3rd Law, if the block applies an impulse to the ball of 10 N*s, the ball must apply an impulse back to the block of 10 N*s in the opposite direction, therefore the block experiences an impulse of -10 N*s. Since its mass is 0.5 kg, its change in velocity must be -20 m/s. If it's going 20 m/s in the positive direction, and experiences a change of -20 m/s, that leaves it at 0. Think of it this way. As the block travels to the right (positive direction) and hits the ball, it pushes the ball to the right, so the ball receives a positive impulse. Likewise, the ball must push the block to the left, so the block receives a negative impulse. This is not a realistic problem, but from a theoretical standpoint it walks you through some of the key points of momentum. The area under a force-time curve gives you the impulse (calculated in part A). In part B, you use the impulse-momentum theorem to find the change in the ball's velocity. In part C, you use Newton's 3rd Law coupled with the impulse momentum theorem to find the velocity of the block after the collision. And in part D, you utilize the definition of a elastic vs. inelastic collisions.

4. ## Triboelectric effect; what you need to know and why you should care.

Nice post HegelBot153. If you wear flannel pajamas and have flannel sheets, rolling over under the covers can be an 'enlightening' experience as well!
5. ## Pro Dart Players, Physics Knowledge?

Some students did a bit of investigating physics of darts not long ago...
6. ## Let's Talk About Webassign

I sent the WebAssign folks this blog post. Haven't heard anything back to date...
7. ## Medical Physics

Great job finding applications of physics concepts to the wider world!
8. ## How a Rock and a Hyperdrive Could Defeat the Empire and the First Order

I'm still trying to figure out why, if they could take out the death star with the ramming/light speed maneuver, wouldn't you have done that with the FIRST ship to run out of fuel?
9. ## A Quarter in Review (The Sequel)

You're more than halfway there... keep up the good work!
10. ## Problem related to power

Hi SamDiab. What have you done so far to get started in this problem? If it has you stumped so far, I'd recommend listing what is given, what you're asked to find, and then looking for potential relationships between the two. For example: m=1.2 kg h=1.4 m t=8 hrs = 28,880 s P= 0.50 hp = 37.28 W Find: mass lifted (then you can divide by 1.2 kg/brick to get number of bricks)
11. ## The New Year's Eve Ball "Drop"

I agree... would be much more exciting if it actually dropped in free fall!
12. ## The Small Angle Approximation

Would you like it to?
13. ## Someone needs to stop Neil deGrass Tyson

Wow, we're in agreement on something!!! I think Dr. Tyson does some wonderful things, but also believe there's further opportunity for respecting and leaving room for the thoughts of others. Which I imagine he does internally, though at times his external image seems to cling more strongly to the black-and-white (which is part of being an entertainer).
14. ## The Small Angle Approximation

Close, but as the angle in radians approaches zero, cosine of the angle won't approach zero... it should approach 1.
15. ## Video Discussion: Brainiac - Electric Fence

Name: Brainiac - Electric Fence Category: Electricity & Magnetism Date Added: 2017-12-18 Submitter: FizziksGuy Electric Fence Experiment Richard Hammond shows the Brainiacs how fun Electricity can be. Also, yes, if you are in the air when the electricity goes through, you don't get a shock. You don't get shocked if the circuit (box to fence to person to ground to box) doesn't complete. On top of that, the end where he ALMOST shakes Hammond's hand, he doesn't. Also, the slight gap in time between feet hitting ground and the shock can be attributed to the 1-2 second delay caused by the fence not being constantly on. Brainiac - Electric Fence
16. ## Brainiac - Electric Fence

Electric Fence Experiment Richard Hammond shows the Brainiacs how fun Electricity can be. Also, yes, if you are in the air when the electricity goes through, you don't get a shock. You don't get shocked if the circuit (box to fence to person to ground to box) doesn't complete. On top of that, the end where he ALMOST shakes Hammond's hand, he doesn't. Also, the slight gap in time between feet hitting ground and the shock can be attributed to the 1-2 second delay caused by the fence not being constantly on.
17. ## Walter Lewin Demonstrates Moment of Inertia

The concept of moment of inertia is demonstrated by rolling a series of cylinders down an inclined plane. Visit physicsworld.com for more videos, webinars and podcasts. http://physicsworld.com/cws/channel/m...
18. ## Video Discussion: Walter Lewin Demonstrates Moment of Inertia

Name: Walter Lewin Demonstrates Moment of Inertia Category: Rotation Date Added: 2017-12-05 Submitter: FizziksGuy The concept of moment of inertia is demonstrated by rolling a series of cylinders down an inclined plane. Visit physicsworld.com for more videos, webinars and podcasts. http://physicsworld.com/cws/channel/m... Walter Lewin Demonstrates Moment of Inertia
19. ## NEW FILE: SimuLAB: Motion in a Circle

View File SimuLAB: Motion in a Circle Interactive simulation lab activity where students explore quantities describing circular motion. Submitter FizziksGuy Submitted 11/30/2017 Category UCM & Gravity
20. ## SimuLAB: Motion in a Circle

Version 1.0.0

Interactive simulation lab activity where students explore quantities describing circular motion.

Free

21. ## NEW FILE: SimuLAB: Universal Gravitation APlusPhysics Simulation

View File SimuLAB: Universal Gravitation APlusPhysics Simulation Interactive simulation to explore the basic relationships in Newton's Law of Universal Gravitation using Geogebra. Submitter FizziksGuy Submitted 11/29/2017 Category UCM & Gravity
22. ## SimuLAB: Universal Gravitation APlusPhysics Simulation

Version 1.0.0

Interactive simulation to explore the basic relationships in Newton's Law of Universal Gravitation using Geogebra.

Free

23. ## NEW FILE: SimuLAB: Coulomb's Law APlusPhysics Simulation

View File SimuLAB: Coulomb's Law APlusPhysics Simulation Lab handout to accompany the APlusPhysics Coulomb's Law mini-lab simulation activity. Submitter FizziksGuy Submitted 11/29/2017 Category Electricity
24. ## SimuLAB: Coulomb's Law APlusPhysics Simulation

Version 1.0.0

Lab handout to accompany the APlusPhysics Coulomb's Law mini-lab simulation activity.

Free

25. ## Newton's Universal Law of Gravitation Introduction (The Big G Equation)

Fantastic video from Flipping Physics -- well done!