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They can't simply go back and forth because otherwise they wouldn't move anything.

If a boat moves itself because it pushes the water, then it has to change the position of the oars (take it out of the water and rotate it) in order to repeat the movement.

If cilia also don't change their position, they would simply move the mucus back and forth and it wouldn't get anywhere. Cilia also rotate in another direction to reach their starting point.

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13y ago

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When you row a boat on the pond why does the boat go forward when you are pulling the oars towards you?

When you row a boat on a pond, you are usually facing the back of the boat. Also, the oars are usually attached in the middle of the oar to the side of the boat. So if you pull the handle of the oar towards the front of the boat (towards you when rowing), the paddle of the oar is moving towards the back of the boat (the oar acts like a lever-arm). To move a boat forward, you actually have to move water backward! It's pushing water back that really moves the boat forward. So, when you pull the oar towards you, the paddle moves towards the back of the boat, and that pushes water towards the back of the boat, pushing the boat the opposite direction, which is forward! Just make sure to turn around once in a while because you're not looking where you are going!


Does rowing a boat increase or decrease friction?

Rowing a boat increases friction. The oars create resistance against the water, which generates friction that helps propel the boat forward.


Are oars attached to a boat first class lever?

Yes, oars on a boat are a type of first-class lever because the pivot point (fulcrum) is at one end, the effort is applied at the other end where the rower pulls, and the resistance is the water pushing against the blade. The oar's position and function follow the principles of a first-class lever.


What happens to energy and matter when rowing a boat?

When rowing a boat, the rower converts chemical energy from their body into mechanical energy to propel the boat forward. As the oars move through the water, they displace water molecules, transferring some of their kinetic energy to the water. Some energy is also lost as heat due to friction between the oars and the water. Overall, energy is conserved, but some of it is dissipated in the form of heat.


What is an everyday example of cilia?

Little hairs that direct dirt and debris out of system... We have cilia in our nose, lungs, and even our inner ears. Probably other places as well... I'm just not sure where else. The cilia in our inner ear helps us hear. The cilia (ciliated epithelial cell) helps clean out our lungs and if we smoke our cilia may stop working which means our lungs will get cloged up and you'll find it harder to breath. Easier: Hairlike structure arranged in tightly packed rows that projects from the surface of some cells.