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: Marie is rolling cards down a hill. She wants to know which cart will get to the bottom of the hill slower, an empty cart, or a full cart? The cart that will finish first will have a mass that is 
 Answer: lower
An object has greater momentum if it has greater mass, greater velocity, or both.

Question: Asa is running in a race and his body temperature decreases. His skin's blood vessels _____ in diameter. 
 Answer: decrease
When your brain senses that your body temperature is increasing, it sends messages to the blood vessels in the skin to increase in diameter.

Question: Two hands are rubbing together fast, two other hands rub slowly, so the faster hands will make heat in amounts that are 
 Answer: larger

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.