A block of mass m slides down an inclined plane. How will its potential energy change if it descends to the height h.
March 28, 2021 | education
| 1) First, let the bar be at the height h0. Then its initial potential energy E0 was: E0 = mgh0.
2) When the bar has dropped to a height h, the height at which it is located becomes equal to h0 – h. Its new potential energy E became equal to: E = mg (h0 – h).
3) Let’s find the change in potential energy: ΔE = E – E0 = mg (h0 – h) – mgh0 = -mgh <0. That is, we get that the potential energy of the bar has decreased by mgh.
ANSWER: decreased by mgh.
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