I am the reason you move, yet you cannot see me; I can be strong or weak, depending on the degree. What am I?
Category: Science · Difficulty: hard
Hint: I am described by Newton's laws.
Answer
Motion
Explanation
Force is an influence that causes an object to undergo a change in motion, as defined in Newton's laws of motion.
This is a hard science riddle — a tricky one that takes a little thought. The answer is Motion.
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