Four students are having a discussion about the question, "What is gravity?" Student A: "Gravity is the force that pulls stuff down."
Student B: "I read somewhere that gravity is an attractive force, and it exists between all objects that have
mass."
Student C: "That doesn't make any sense. If that's true, then why don't all objects start clumping together and
moving toward each other?"
Student D: “Doesn't it have something to do with the size of the objects? You're pulling on objects, but Earth is
bigger, so it has a stronger pull."
Question 1
How would you respond to each of the students?