This situation produced by Henry kicking the rock demonstrated Newton's first law of motion.
This law states that an object in motion tends to stay in motion, whilst an object at rest tends to stay at rest. To put it more simply, an object will not change its movement unless another force is acted upon it which is strong enough to change its motion. This is what Henry demonstrated by having to kick the rock in order to cause movement.
Therefore, we can confirm that this situation produced by Henry kicking the rock demonstrated Newton's first law of motion, which came to be known as inertia.
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