Force and Potential Energy
The mutual gravitational potential energy U = -Gm1m2/r between an 80-kg object and the earth is shown versus their separation r. Dropping a brick onto a spring-mounted platform: using elastic and gravitational potential energies together. Initial position Maximum compression The total fall of the block is h + y. The potential energy U = 1/2 kx2 is shown for a spring. When the spring is compressed, x<0, the slope is negative, and the force is positive. When the spring is stretched, x>0, the slope is positive, and the force is negative.
Description
A well compiled table shows the different forms of potential energy for various kinds of forces.Superposition of forces, p.e of spring system and numerical on this topic are the other highlights of this lecture note.In one of the numericals a brick is dropped onto a spring mounted platform and its motion is analyzed using elastic and gravitational potential together.Motion of simple pendulum and non-conservative forces are also described.
Prof. Stanley Kowalski, Physics 8.01 2003 Massachusetts Institute of Technology: MIT OpenCourseWare),http://ocw.mit.edu (Accessed Aug 1st,2011). License: Creative Commons BY-NC-SA: http://ocw.mit.edu/terms/#cc
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