instruction:
In this task, you are given a question and answer for that. The answer will fill in the blank or will complete the unfinished question. Your task is to provide an explanation based on the given question or fill-in-the-blank statement, and answer.
question:
Question: If Milo starts rubbing two surfaces together quickly and then decrease the speed, what happens to the amount of energy produced? 
 Answer: decreases
answer:
Friction causes the molecules on rubbing surfaces to move faster, so they have more energy. This gives them a higher temperature, and they feel warmer.


question:
Question: When April rested on the couch, as opposed to running, she noticed that her heart was beating 
 Answer: slower
answer:
Warming up exercises increases the blood flow to the muscles and increases the heart rate.


question:
Question: Eric saw a fast moving particle and a slower one. The fast moving particle has _____ energy than the slower one. 
 Answer: more
answer:

The particles in matter are always moving. The more energy they have, the faster they move.