Sir hope you are doing well. I have 2 questions. Please do answer them. 1) if a quantity say x is directly proportional to y, does it imply that y is also proportional to x. I mean that is proportionality between two variables both ways correct. 2) Is friction due to intermolecular force of attraction or repulsion. Since normal force and friction are both components of contact forces and normal force is a kind of repulsive ( push), shouldn't the friction also be due to repulsive intermolecular forces. I want to understand the origin of friction at microscopic level. Thank you
There is a typo in the slide for the static friction problem ~8 min 379 N is the static friction, but it is labeled as kinetic friction although the audio describes it correctly.
At 8:23 , it says how much force to get it started moving so wouldn't that mean the static force should be greater than the multiplication of the mu (coefficient) and normal force which would mean the applied force would be greater than 379N? How are they equal when the object is supposed to move?
Sir hope you are doing well.
I have 2 questions. Please do answer them.
1) if a quantity say x is directly proportional to y, does it imply that y is also proportional to x. I mean that is proportionality between two variables both ways correct.
2) Is friction due to intermolecular force of attraction or repulsion. Since normal force and friction are both components of contact forces and normal force is a kind of repulsive ( push), shouldn't the friction also be due to repulsive intermolecular forces.
I want to understand the origin of friction at microscopic level.
Thank you
This is very helpful.
By the way, I saw your video series on light, it is wonderful, especially the refraction (portion).
absolutely loved this so helpful. thank you
So glad you liked this. Tell a friend or classmate.
There is a typo in the slide for the static friction problem ~8 min 379 N is the static friction, but it is labeled as kinetic friction although the audio describes it correctly.
Thanks for the heads up. Looks like the text switches from static to kinetic around line 3 of the solution. Drats!
At 8:23 , it says how much force to get it started moving so wouldn't that mean the static force should be greater than the multiplication of the mu (coefficient) and normal force which would mean the applied force would be greater than 379N? How are they equal when the object is supposed to move?
Would 379.0000001 N work for you?
I need force of friction!
I need force of friction
bill nye the science guys better
Admittedly yes.