Force equation Definition and 68 Threads

Homework Statement Derive the equation for the normal force (N) and the static frictional force (F) in terms of the weight (Mg). \beta is the angle of inclination. Homework Equations http://img62.imageshack.us/img62/5559/normalforcediagram.png The Attempt at a Solution - For N I...

I know I am not doing collage or uni stuff but this is more advance stuff that that by a little bit. Does anyone know an equation for the force between 2 magnets. the only one we get is for a magnet and a wire f=ILBsinΘ. This is to help me with an investigation with an electro magnet and...

Homework Statement Newton's Law of Gravitation states that two bodies with masses m1 and m2 attract each other with a force: F=\frac{Gm_{1}m_{2}}{r^2} where r is the distance between the bodies and G is the gravitational constant. If one of the bodies is fixed, find the work needed to...

Homework Statement A 18.6-kg box rests on a frictionless ramp with a 13.7° slope. The mover pulls on a rope attached to the box to pull it up the incline. If the rope makes an angle of 38.8° with the horizontal, what is the smallest force F the mover will have to exert to move the box up the...

\textbf{L} \ = \ q\left( \textbf{v \ x \ B} \right) L, v, and B are vectors, and B represents magnetic induction. if \textbf{v} \ = \widehat{x}, then \textbf{v x B} = \widehat{x} \ \textbf{x B} What is this quantity, \widehat{x} \ \textbf{x B}, geometrically?

Am getting really confuse with some force related equation.. Power = Workdone / Time = Force X Speed BUT THIS FORCE is it the one that makes the object move or the friction force( the one opposing the motion ) Because one of my homework makes me think that it's the frictional...

Hello, The Lorentz force equation, F = q (E + v x B), is a complete description of the force on bodies arising from Magnetism and Electricity, right? So somehow it must be possible to get from the magnetism that exists in materials (like in a magnet) to this equation. I don't see how the...

How high above the surface of the Earth should a rocket be in order to have 1/100 of its normal weight? Express your answer in units of Earth radii. Im not sure were to start with this one. I know that the moon is 60 times as far away as the core of Earth to the surface.

What type of equation would I use to find the resultant force? Do I just add the vectors together? Or change them to X and Y variable?

As most of you know, the drag force equation is Fd=1/2*p*Cd*V^2*Cd*Ac. At terminal velocity, Fd equals weight. If you find the value of all the variables except Cd and V, you still won't have anything. But the terminal velocity equation is Vt= sqrrt of 2weight/p*Cd*Ac. So if V is terminal...

Hello everyone. I have researched from the internet that the drag force equation for projectile motion is either F= C p a v^2 or F= 0.5 C p a v^2. Which one is the correct one? The initial speed I am dealing with is about 20m/s. And what's the value for C for a normal tennis ball. Other sites...

When you drop a (strong) magnet into a copper pipe, it slows down. Is there an equation for calculating the force? I have searched and searched Google, but all i found was F=[(B^2)(l^2)v]/R, where B = magnetic field, l = circumference of tube, v = velocity of magnet, and R = resistance of pipe...

Say you had a spring hanging vertically-- spring constant k. A mass m is attached to it and it's at its equilibrium position, b. Say, I decide to extend it (downward) such that its total extension distance from how it would be normally (without the mass) is x. Say I take the upward direction as...

I have set up an equation like this: v= r x omega mu x m x g = m v^2 /r but I didn't get the answer, which is 15.7. Is the setting right? If not, can anyone show me the right steps? thx!

Hi All, Just a thought. The Lorentz force equation as we all know is: F = qE + qvxB. We know that Electrical Field can be written as del(Phi), where Phi is the electrical potential. Also, Force can be written as del(Energy) - correct me on this one. Hence is there a representative term...

I've been trying to derive the Roche Limit and have been successful for the most part but out of curiosity i was wondering how the tidal force equation was derived to be: -2GMmr/d^3 ?? Also on a related note i always get the constant at the front of the Roche Limit equation to be the cube...

I have read the equation F = ma "does not apply directly on the very small scale of the atom where quantum mechanics must be used." What exactly is therefore used instead of F= ma? Furthermore, would it be possible (if we ignore the complexity of them) to use these quantum calculations to...

F = ma + mvxw where: F=force, m=mass, a=static gravitational field, v=velocity of mass 'current', x=cross product, w=angular velocity of rotating mass. To confirm: Follow Maxwell's derivation for electromagnetic equations, but rather than initiating with F=qE as the static manefestation...