Recent content by mrkrupa

Obviously but i was wondering if i could get a few formulas and a couple explanations I know of one way that I can do it quadraticaly but I don't understand the others

I have a cannon that fires blocks of plaster of paris what are the basic formulaes that i need in order to be able to calculate the angle in order to shoot a projectile a specified distance. I want to take as many variables into account such as air density and so forth (please give values) so...

ok, thank you

one more thing, is there a unit for the .5?

I got the angle of x to be 26.57 degrees, and then the height to be 41.18cm. Thank you for the help

oh, ok

I have guessed a height of 30 cm. That gives x an angle of 19.27 degress And I have calculated that at 19.27 degrees, the force of friction would be 2.55N. Also, the natural force would be 6.86N. Now, I am stuck on how to figure what the coefficient of static friction would be to see if...

now I am all confused... Do I need to estimate a height, use that to get the angle from my attachment above, then take that angle put it into tan(x) to get the coefficient?

Is this where x is for Tan(x)?

ok, i'll try to work it all out

ok, i get that now. But is there a formula to determine when the static friction will become kinetic friciton? or is that the level at which the friction turns into kinetic?

so how would i use the coefficient of friction to figure out the height?

Here is my force diagram I'm trying to figure out how to tell when the friction force has decreased enough for the object to move.

what is a coefficient of friction?

and wouldn't you need the mass to find the force of gravity, and from there you could find the force of friction and the natural force.