Calculating Rotational Speed of Car Tyres: How Many Spins in a Given Distance?

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SUMMARY

The discussion centers on calculating the rotational speed of car tires based on their diameter and the distance traveled. To determine the number of revolutions, one must first calculate the circumference of the tire using the formula C = π * D, where D is the diameter. The distance traveled by the car is then divided by the circumference to find the revolutions per second. For example, with a tire diameter of 28 inches and a travel distance of 34 feet, the result is approximately 4.64 revolutions, equating to 1670 degrees.

PREREQUISITES
  • Understanding of tire circumference calculation
  • Basic knowledge of distance and speed relationships
  • Familiarity with angular speed concepts
  • Ability to convert between feet and inches
NEXT STEPS
  • Learn how to calculate tire circumference using the formula C = π * D
  • Research angular speed and its relation to revolutions per second
  • Explore the impact of tire diameter on vehicle performance
  • Study the effects of skidding on tire rotation and vehicle control
USEFUL FOR

Automotive engineers, physics students, and anyone interested in vehicle dynamics and tire performance calculations.

gmxplode
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Rotational Speed of Car tyre?

hey guys i was trying to figure out this rotational speed of car tyre?...i have with me the diameter of the car tyre and the distance which it is traveling and the length of the car...so can anyone help? i need to find out how much times will the tyre spin and at what speed in that traveled distance?
 
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Just work out the circumference of the tyre. Then divide the distance traveled by the car in one second by the circumference. That will be the number of revs per second.
The length of the car is not relevant (you could go on just one wheel, if you could stay upright.).
 


sophiecentaur said:
Just work out the circumference of the tyre. Then divide the distance traveled by the car in one second by the circumference. That will be the number of revs per second.
The length of the car is not relevant (you could go on just one wheel, if you could stay upright.).

ok thanks for the information...so if the car is traveling 34 feet and the diameter is 28 inches then the result I am getting is 4.64 revolution which is equivalent to 1670 Degrees..is it correct?...
 


gmxplode said:
ok thanks for the information...so if the car is traveling 34 feet and the diameter is 28 inches then the result I am getting is 4.64 revolution which is equivalent to 1670 Degrees..is it correct?...

That looks good to me.
 


AlephZero said:
That looks good to me.

this 34 feet is the total distance traveled and not distance traveled in one second so is it still correct?
 


OMG, I'm laying in bed and the man wants me to do feet and inches.
But you can do total distance traveled in any time interval. If each rotation is 360 then the angular speed is revs per second / hour / week times 360.
G'night. :-)
 
sophiecentaur said:
OMG, I'm laying in bed and the man wants me to do feet and inches.
But you can do total distance traveled in any time interval. If each rotation is 360 then the angular speed is revs per second / hour / week times 360.
G'night. :-)
Ok thanks got ya...
 


Of course, the velocity that the tire is moving where it meets the road must be zero, or you'll be skidding :)
 

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