MIT 2.003SC Engineering Dynamics, Fall 2011 View the complete course: ocw.mit.edu/2-003SCF11 Instructor: J. Kim Vandiver License: Creative Commons BY-NC-SA More information at ocw.mit.edu/terms More courses at ocw.mit.edu
DR. Vandiver, thank you for a awesome explanation of the Degrees of Freedom, Free Body Diagrams and Fictitious Forces in Engineering Dynamics. MIT really brings out the best in all technical subjects.
Find the number of degrees of freedom for a rigid body which can move freely in three dimensional space has one point fixed but can move in space about this point.
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
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.
Pravinkumar Kale Well, this is response might be a little bit late but anyways... If you check the reference system used in that example, the direction of the y axis is not upwards but normal to the inclined plane. That means that if the ball moves along the y direction on that inclined reference system, it would mean that the ball is not anymore in touch with the plane but floating on the space. To see this more clearly, draw a point with positive y value on that reference system and you will see why the ball is restricted on that direction!
