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visits member for 2 years, 3 months
seen Apr 6 at 21:23

I have a question.


Sep
24
awarded  Autobiographer
Apr
1
awarded  Popular Question
Jan
5
awarded  Scholar
Jan
5
accepted Why is the velocity on the top of a wheel twice the velocity of its axle?
Jan
5
comment Why is the velocity on the top of a wheel twice the velocity of its axle?
Thanks a lot for your time, I get it!!
Jan
3
comment Why is the velocity on the top of a wheel twice the velocity of its axle?
@MichaelBrown I'm also struggling to understand that "The contact point is stationary because the wheel is not slipping.". Isn't the contact point ever changing? If I mark a point on the bottom of the wheel with a chalk, it'll move upwards as the wheel rolls, right? So how is the contact point stationary? Or does that mean that at every moment the one contact point at that time is stationary?
Jan
3
comment Why is the velocity on the top of a wheel twice the velocity of its axle?
@MichaelBrown "The relation between the velocity at the top, centre and bottom of the wheel is geometrical". Could you please elaborate a little bit more on the geometry? I know that an inscribed angle in a circumference determines an arc measuring twice its length, for example --and I fully comprehend the triangular similarity involved in that. Does that have anything to do with the wheel? I don't understand how.
Jan
3
awarded  Student
Jan
3
asked Why is the velocity on the top of a wheel twice the velocity of its axle?