Solving a Circular Motion Problem - Expert Tips and Techniques

AI Thread Summary
To solve the circular motion problem, it is essential to include actual attempts and equations used in the calculations. A Free Body Diagram should be drawn to illustrate the forces acting on the occupants, particularly focusing on the normal force, which is given as one-fourth of their weight. The radius of the loop cannot be determined from the rollercoaster's mass but rather from the radius of the arc followed by the occupant's center of mass. The discussion emphasizes the need for clarity in the problem-solving process by detailing the principles and equations applied. Providing thorough explanations alongside calculations is crucial for effective problem-solving in physics.
bloodlust_X
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Homework Statement
During the Physics Field Trip to Six Flags, Skyler and Jayson experienced a looping roller coaster ride for the first time. Their 656-kg roller coaster car was moving at 15.8 m/s at the top of the loop where occupants experienced a normal force equivalent to 1/4-th their weight. Determine the radius of curvature of the loop.
Relevant Equations
So I tried using F = mv^2/r, and f =mg to cancel mass but it didn't work, also its confusing which forces are supposed to be used?
Fnet would otherwise be 4281N, after subtracting 1/4 of rollercoaster's weight?
Could someone please help me solve this?
 
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Please give us your actual attempt including the equations you wrote down. Show us what you did, don’t just describe it in words.
 
bloodlust_X said:
occupants experienced a normal force equivalent to 1/4-th their weight.

after subtracting 1/4 of rollercoaster's weight
It's the occupants that you have the normal force info on. Have you drawn a Free Body Diagram for one of those? What forces does it show?

Btw, you can't actually find the radius of the loop as a track, only the radius of arc the occupant's mass centre is following.
 
Orodruin said:
Please give us your actual attempt including the equations you wrote down. Show us what you did, don’t just describe it in words.
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haruspex said:
It's the occupants that you have the normal force info on. Have you drawn a Free Body Diagram for one of those? What forces does it show?

Btw, you can't actually find the radius of the loop as a track, only the radius of arc the occupant's mass centre is following.
so nothing to do with the mass of the rollercoaster in the problem?
 
That doesn’t really tell us what you did. Please type it out with your arguments in between the equations. (See the homework guidelines)
 
As @Orodruin notes, posting that working doesn't tell us what principles you are using. But reverse engineering your first equation, it says centripetal force = gravitational force/4. Is that what the question says?
 
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