Question

What are the two forces that friction doesn't depend on?

Answer 1

The velocity, accleration, and the force acting on the object does not matter.

Answer 2

There are actually three, gravity and both (strong and weak) nuclear forces. Friction is a result of the electromagnetic force and of the "excluded volume" force that arises from quantum statistical mechanics.

Answer 3

Although....perhaps you mean something different. Perhaps you're driving at the fact that friction force is proportional only to the normal component of force pressing an object into a surface. If you resolve any force on the object into Cartesian components, the two components parallel to the surface have no connection to the friction force.

Answer 4

the mass of the object and the surface material does matter, right?

Answer 5

The gravity can matter though- it usually does.
The force of friction =the coefficent of frictionxthe Normal force.
The normal force is usually mg or some variation of that.

Answer 6

Thank you :) I'm taking a course in fundamental physics so, I'm guessing I need a fundamental answer like the one youngster gave.

Answer 7

I have a physics problem involving vectors and trig, are you guys able to help me with it? It's attached

Answer 8

Will you guys take a look at the problem?? Would really appreciate that ;)

Answer 9

working on it

Answer 10

Thank you :D

Answer 11

I think I'm able to answer the first question. Is it 250 m away from point B?

Answer 12

I got that too. I wasn't too sure of my answer.

Answer 13

we used the angle to figure that out, right?

Answer 14

yes.

Answer 15

what about the second question? In what direction should he sail in order to get to point B with the wind prevailing? I got the final answer as 50 degrees, I used laws of cosines to figure out the sides and angles of an additional triangle that has one side as the hypotenuse of the other. and the other side as 250. I hope that makes sense.

Answer 16

I'm still working at it.

Answer 17

I drew this, it's a depiction of what I think it's asking for. It's just that I don't know how to use the velocities given.