- #36
aloshi
- 80
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I have read "An elementary treatise on mechanics" and i have some difficulty in understanding.
1)
“When two bodies in motion impinge, if their centers of inertia move in the same straight line perpendicular to a plane tangent to the bodies at their point of contact , the impact is said to be direct and central.”
I can not really understand:
“the same straight line perpendicular to a plane tangent to the bodies at their point of contact”
if I'm drawing a picture of how the impinge look;
[PLAIN]http://www.pluggakuten.se/wiki/images/2/22/F%C3%B6rsta.jpg
[PLAIN]http://www.pluggakuten.se/wiki/images/2/22/F%C3%B6rsta.jpg
Have I understand’t correct?
2)
I can not really understand:
“if the straight line described by the center of inertia of one of the bodies is not perpendicular to the tangent plane , the impact is said to be oblique.”
if I'm drawing a picture of how the impinge look:
[PLAIN]http://www.pluggakuten.se/wiki/images/c/c7/Andra.jpg
[PLAIN]http://www.pluggakuten.se/wiki/images/c/c7/Andra.jpg
Have I understand’t correct?
it is from 240. DEF. in "An elementary treatise on mechanics"
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