Deriving a Uniform Circular Motion Equation

In summary, the conversation is about deriving the equation (mV^2/r)cos(x) = mgsin(x) using Circular Motion Equations and Newton's 2nd Law. The equation can be simplified to tan(x)mg = mV^2/r and is related to a banked curve question involving a horizontal circle. A diagram is suggested to help visualize the forces and acceleration involved, and the teacher asks for the values of the forces and acceleration without theta.
  • #1
ethanh
3
0
Derive the following equation: (mV^2/r)cos(x) = mgsin(x)

I don't know how you would exactly derive the equation but you can simplify it to:

tan(x)mg = mV^2 /r

You can also divide by the m and get tan(x)g = V^2/r ...


Any help is appreciated.
 
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  • #2
ethanh said:
Derive the following equation: (mV^2/r)cos(x) = mgsin(x)

Hi ethanh! :smile:

hmm … doesn't look right to me … :confused:

Can you show us the whole question? :smile:
 
  • #3
The teacher just said to derive the equation using Circular Motion Equations,Newton's 2nd Law, etc.

The equation is:

m(V^2/r)cos(θ)=mgsin(θ)
 
  • #4
The only place where I can see you deriving this from is from a banked curve question, so think about the forces acting there.
 
  • #5
… draw a diagram … !

Yeah … Snazzy's right (and I was being dense). :redface:

Thanks Snazzy! :smile:

It's a horizontal circle, banked like a cycle track.

ok, draw a diagram of just one bit of the track, and draw in the two forces and the acceleration (so that's three arrows … and give each one a letter, of course), and the angle.

Do you know the values of any of these forces or acceleration (without any theta)? :smile:
 

1. What is uniform circular motion?

Uniform circular motion refers to the motion of an object along a circular path at a constant speed. This means that the object is moving at the same speed and direction at all points along the path.

2. How do you derive a uniform circular motion equation?

The equation for uniform circular motion can be derived by using the principles of circular motion and Newton's laws of motion. It involves finding the relationship between the linear and angular velocities, as well as the centripetal acceleration of the object.

3. What are the variables in a uniform circular motion equation?

The variables in a uniform circular motion equation include the angular velocity (ω), the radius of the circular path (r), and the centripetal acceleration (ac). Other variables that may be involved depending on the specific problem include the mass of the object (m) and the tangential velocity (v).

4. How can uniform circular motion equations be applied in real life?

Uniform circular motion equations are commonly used in many real-life situations, such as the motion of planets around the sun, the motion of a Ferris wheel, or the motion of a car around a curved track. They can also be applied in engineering and technology, such as in the design of roller coasters or satellite orbits.

5. What are some common misconceptions about uniform circular motion?

One common misconception about uniform circular motion is that the object is constantly accelerating due to its change in direction. In reality, the object is moving at a constant speed and its acceleration is due to the change in direction, not the change in speed. Another misconception is that the centripetal force is a separate force acting on the object, when in fact it is the net force keeping the object in its circular path.

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