Pablo and Charles were conducting an investigation where they were measuring the energy of a glass marble as it rolled down a ramp. According to their calculations, the total energy of the marble decreased. Which statement below is the best explanation for the decrease in total energy?

a. The energy decreased because it was destroyed by the interaction with the ramp.

b. The total amount of energy always decreases in an energy conversion and is expected.

c. The scientists’ calculations were incorrect; the energy totals should have been the same.

d. The energy decreased because heat resulted from the friction between the marble and the ramp.

c. The scientists’ calculations were incorrect; the energy totals should have been the same.

Explanation:

We must remember that energy can not be created nor destroyed according to the law of conservation of mechanical energy.

The total energy of a body remains a constant throughout its motion. For a body rolling down a ramp, the energy  changes from potential to kinetic + potential and then to kinetic.

In all of these stages of its motion, the total energy of the glass marble remains constant.

odds are decent that your handwriting right now looks a little bit different than it did five years ago, and will look different again in five more. when i look back through my notebooks from middle school to now, i see a long, slow progression from meticulous and teeny letters to bigger, sloppier ones, plus a few side detours: sometime in high school, for example, i decided those loopy cursive lowercase f’s were just the coolest, adopting them as the lone rep for cursive in my otherwise all-print handwriting.

explanation: