question: Write a question you would see in a school textbook. OPTIONS:
- a force pushing on the object from the opposite direction
- a force that continually acts on the object in the direction the object is moving
- an increase in the mass of the object
- a decrease in the mass of the object
answer: What can cause a moving object to increase its speed in a forward direction?

question: Write a question you would see in a school textbook. OPTIONS:
- gas
- light
- sound
- shadows
answer: Matter that is vibrating is producing ___.

question: Write a question you would see in a school textbook. OPTIONS:
- mass
- volume
- shape
- distance between particles
answer:
Which of the following properties of a substance is conserved during thermal expansion?