10 thoughts on “7. Degrees of Freedom, Free Body Diagrams, & Fictitious Forces

  1. I have little doubts: I understand all other constraints but I did not understood how they consider constraints in y direction as wheel can have up and down vertical motion so how we can consider there is no any movement in the direction of y.

  2. In the last example:
    I think that there is another Torque acting on point O caused by weight of the object and the R:              (R*R^) x (Μ g*(-Κ^)) = T*Θ^
    ^ –> hat
    * –> in the direction of

  3. In the elevator problem, shouldn't the scale read at maximum the weight of the person ? The scale is only a spring in its simplest model, and the reading is taken from the spring deflection, the forces contributing to spring deflection are only the forces that compress it (i.e if I have a spring with 1000N from this side => spring <= 20N from this side, the I will have 20 N compressing the spring and 980N accelerating in the 1000N direction).
    If we did the experiment I believe the scale will read more than the person's weight at START, but that's due to shock effects, in other words while in the transient state (the period until the force reaches the whole spring and move it without relative motion between one coil and another)

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