The commentary may be a bit misleading. For example, when Ruby licks sister Pearl, the action (the force exerted by Ruby's tongue on Pearl's head) is equal in magnitude (strength) and opposite in direction to the reaction (the force Pearl's head automatically exerts back on Ruby's tongue).
Newton's 3rd law of motion, example 1.
The commentary may be a bit misleading. For example, when Ruby licks sister Pearl, the action (the force exerted by Ruby's tongue on Pearl's head) is equal in magnitude (strength) and opposite in direction to the reaction (the force Pearl's head automatically exerts back on Ruby's tongue).
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