Humans observe early on that things fall towards the earth when let go. This is due to the (4)_____, which states that the force of gravity acts between all objects in the universe. The scientists that discovered the was (5)______. He described the force that pulls objects toward each other as (6)_____. When we measure the amount of gravitational pull on an object, we call that quantity (7)_____. This is different than an object's (8)_____, which is the amount of matter an object is made of.
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