I'm having trouble with identifying simple machine.
1)A row boat
2)saw
3)an arm flexing
4)a person hiking
5)a person catching
6)a bikes wheel
Help please!
It's 6, I think, the wheel. Look at all the other ones there: most of them have to do with people, who are most definitely not machines and not simple! A row boat is too big of a thing to be simple, and I don't think it's the saw. That leaves the wheel. Um, look at the note:
Note: this is what I remember from 4th grade science. Don't quote me on it.
http://www.infoplease.com/ce6/sci/A0859409.html
the row boat is simple because it has rows that push the boat using the force of water as a levy to push it. Like a saw is not a machine just a tool, an arm is not a machine, a person hiking is not a machine, person catching is not a machine, wheel can be part of a machine but is not a machine in it's self.
To identify whether something is a simple machine, you can start by understanding the basic definition of a simple machine. A simple machine is a device that helps us do work more easily or efficiently by changing the direction or magnitude of a force. They are the building blocks of more complex machines.
Now, let's analyze each item you mentioned to determine if it is a simple machine:
1) A row boat: A row boat is not a simple machine. It is a combination of several simple machines, such as levers (oars), pulleys (block and tackle systems used in some rowing boats), and maybe even a wheel and axle (for the rudder).
2) Saw: A saw is considered a simple machine. It is classified as a wedge, as it has a sharp, angled cutting edge that separates materials by applying a force over a small area.
3) An arm flexing: An arm flexing is not a simple machine. It is a body part that exhibits motion but does not meet the criteria of a mechanical device designed to perform work.
4) A person hiking: Hiking is an activity and not a machine. It does not fall under the definition of a simple machine.
5) A person catching: Similar to hiking, catching is an action performed by a person and does not fall under the category of a simple machine.
6) A bike's wheel: A bike's wheel can be considered a simple machine. It is classified as a wheel and axle. The wheel is the circular part that rolls, and the axle is the rod at the center on which it rotates.
Remember, the key is to look for devices that perform work by changing the direction or magnitude of a force.