An octopus propels itself through the water by ejecting water through a funnel in its body. How does this demonstrate newton's third law
Newton's Third Law of Motion states that for every action, there is an equal and opposite reaction. In the case of an octopus propelling itself through water, the action is the octopus ejecting water through a funnel, and the reaction is the force that propels the octopus forward.
When an octopus contracts its mantle muscles, it squeezes the water inside its body and forces it out through the funnel. As the water is expelled backward with great force, according to Newton's Third Law, an equal force is applied in the opposite direction, propelling the octopus forward.
Essentially, the octopus uses the action of expelling water to create a reaction force that drives its own movement. This propulsion method allows the octopus to move swiftly through the water by alternating the direction of its funnel and adjusting the force and angle of water ejection.