Recent content by newcool

1 =-2\frac{d^2 x}{dt^2}*(\frac{dx}{dt})^2 ?? I have only covered up to integration in calculus.

From a physics problem I obtained this differential equation. \frac{d^3x}{dt^3} =-2(\frac{dx}{dt})^3 Would appreciate any tips on how to solve it as I have no idea on how to start.Thanks for the help

You are making the equation too complex. Think about what force(s) are keeping the car in the circle and write another equation.

bump bump bump

There is no friction force pointing out of the circle. The only frictional force is pointing in because it keeps the car in the circle. The normal forces and friction forces are vectors and can be broken up into horizonal and vertical components. Then you can say that the sum of all vertical...

I think you can't use V^2 = 2ax because the linear acceleration is not constant. It starts at p and then goes down to 0. thanks

A car is at rest in a circle of radius r. The car then accelerates, but friction limits the speed to some max speed v. At what angle is the max speed v reached? (calculus is involved). The key is to draw a detailed FBD, which I need help with. So far the forces I have are: centripetal...

bump. Any help appreciated. Thanks

You don't need to know time. F_s = ma You know F_s, you know m and you know that a = v^2/r

At max speed: F_s = ma F_s = u_s * N = u_s*mg Remember that a = v^2/r and solve for v.

Use simple trigonometry to find the height using the angle. Then use conservation of energy: Delta(K.E) + Delta(P.E) =0

No information about acceleration is given. Teacher said that when you draw the right FBD it will become very simple

So There is friction perpendicular to the centripetal force and friction parallel to centripetal force. How are the 2 related?

I thought that was the static friction.

What are the Forces of a car that is accelerating around a circle? There is friction between the road and the car. centripetal force(in towards the circle) Static Friction(in towards the circle) However there is also another component of friction that I am missing? Any ideas? Thanks