- #1
luis20
- 50
- 0
Hi everyone :). I have one question about classical mechanics, which is illustrated in the attachment.
The question is: for rigid bodies, how can the same external force F produce more overall movement in situation A) than in situation B)? This seems to contradict the conservation of energy!
The same external force F is applied in situations A) and B). Since the point of application in A) is away from the center of mass C, we can move that force to C and add a torque T (it's the same).
But if I had applied this force F in the center C in the first place (situation B) I wouldn't have this extra torque!
Conclusion:
The sum of acceleration/velocity/distance traveled of all points of the body is higher in A) than in B). So we give more cinetic energy if we apply this force F away from the center of mass C?
Thanks in advance and I'm sorry if my english isn't the best ^^
The question is: for rigid bodies, how can the same external force F produce more overall movement in situation A) than in situation B)? This seems to contradict the conservation of energy!
The same external force F is applied in situations A) and B). Since the point of application in A) is away from the center of mass C, we can move that force to C and add a torque T (it's the same).
But if I had applied this force F in the center C in the first place (situation B) I wouldn't have this extra torque!
Conclusion:
The sum of acceleration/velocity/distance traveled of all points of the body is higher in A) than in B). So we give more cinetic energy if we apply this force F away from the center of mass C?
Thanks in advance and I'm sorry if my english isn't the best ^^