- #1
Leo Liu
- 353
- 156
- Homework Statement
- A quiz question
- Relevant Equations
- ##E_i=E_f##
I don't get why the total mechanical energy is not conserved in this situation.
When the length of the spring reaches the maximum, the speed of the block is 0 and we have the following equation:
$$E=K+U=1/2mv^2+1/2kA^2,\text{where A is the amplitude} \implies E=1/2kx_{max}^2$$
I can't see why the amount of energy changes. Could someone please explain the reason to me? Thanks a lot.