String in vertical circular motion

In summary, the conversation discusses the concept of speed in vertical circular motion. The question is whether an object tied to a string in vertical circular motion changes speed. The speaker was given a question where the average speed was 6.1 m/s and was asked to find the point of least speed. The conversation then explores why speed changes in circular motion, with the speaker noting that they were taught that the speed is always the same but the object is accelerating due to direction changes. The other person in the conversation mentions that this may only apply to horizontal circular motion and gives the example of a roller coaster where speed changes during different parts of the trajectory. The conversation concludes with the speaker thanking the other person for their help.
  • #1
BassMaster
31
0
If an object is tied to a string in vertical circular motion (yes, I mean vertical as in the string has the force of gravity acting on it), does it actually change speed? I was given a question where the 'average speed' of an object in vertical circular motion was 6.1 m/s, and then they wanted me to find the point of least speed. So I guess speed changes then? But why? I was taught that the speed of an object in circular motion is always the same but the object is accelerating because direction changes. Does this ONLY apply to horizontal circular motion?
 
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  • #2
no sir, yes sir. The speed in say a loop de loop roller coaster most certainly changes with uphill or downhill part of the trajectory. Yet its still executing circular motion.
 
  • #3
Alright, thanks for your help.
 

FAQ: String in vertical circular motion

What is string in vertical circular motion?

String in vertical circular motion refers to a situation where a string or rope is attached to a mass that is moving in a circular path in a vertical plane. This is often seen in amusement park rides such as the Ferris wheel or roller coaster.

What is the role of the string in vertical circular motion?

The string plays a crucial role in keeping the mass moving in a circular path. It provides the necessary centripetal force to the mass, which is required for circular motion. Without the string, the mass would move in a straight line instead of a circular path.

How does the tension in the string affect the motion of the mass?

The tension in the string affects the motion of the mass by providing the centripetal force necessary for circular motion. As the mass moves faster, the tension in the string increases to match the centripetal force needed. If the tension is too low, the mass will not be able to maintain its circular path and will fly off in a straight line.

How does the radius of the circular path affect the motion of the mass?

The radius of the circular path affects the motion of the mass by determining the speed and acceleration of the mass. The larger the radius, the greater the speed and acceleration required for the mass to maintain its circular path. This can be seen in amusement park rides where the circular path of the ride becomes smaller, causing the ride to move faster.

What factors can affect the tension in the string in vertical circular motion?

The tension in the string can be affected by factors such as the mass of the object, the speed of the object, and the radius of the circular path. The greater the mass or speed of the object, the higher the tension in the string will need to be. Similarly, a smaller radius will also require a higher tension in the string to maintain circular motion.

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