friction
friction stops things from moving and slows it down
According to Newton's first law of motion, an object that is in motion will stay in motion. Basically if an object is moving, unless something stops or alters its path in any way, the object will continue to move down the same path.
The object slows down and eventully stops.
It resists the motion (slows it down)
This is an interesting point of Newtonian physics, because it requires you to look at the world a different way. Our normal experience is that when something is in motion, it only moves for a certain period of time, then it slows down and stops. No matter what it may be, whether a spinning top, a thrown ball, a falling rock, whatever, everything comes to a stop, sooner or later. Newton's insight is that motion does not just evaporate, it doesn't disappear of its own accord, motion stops because something stops it. Things stop moving because there is some kind of friction or other force which opposes that motion. Whereas, when an object is moving in an environment in which there is no force opposing that motion, it will just keep moving. Inertia is that property which allows motion to continue. Inertia does not just dissipate, it remains, until some other force counteracts it. That is why we say that an object in motion will tend to remain in motion. It does have that tendency, even though in our normal experience, other factors are going to overcome that tendency.
friction
Friction always want to retard the motion of a moving object. So friction slows down and finally stops a moving object.
friction stops things from moving and slows it down
According to Newton's first law of motion, an object that is in motion will stay in motion. Basically if an object is moving, unless something stops or alters its path in any way, the object will continue to move down the same path.
Forces are pushes or pulls. They can start objects moving, they can stop,speed up, slow down, or change the direction of moving objects. They can lift things, or cause them to turn, bend or twist. They can also prevent motion; eg. a handbrake on a car stops it from rolling down the hill.
The object slows down and eventully stops.
It resists the motion (slows it down)
It resists the motion (slows it down)
by moving them up and down in a chewing motion
What happens to pieces of rock that are carried along by wind, moving ice, or moving water? A fast wind eventually slows down. A glacier stops moving and eventually melts at its front end and sides. All streams eventually slow down and end when they flow into a large body of water, such as a lake or ocean. When water stops moving, it also stops moving, it also stops carrying along bits and pieces of rock are dropped
This is an interesting point of Newtonian physics, because it requires you to look at the world a different way. Our normal experience is that when something is in motion, it only moves for a certain period of time, then it slows down and stops. No matter what it may be, whether a spinning top, a thrown ball, a falling rock, whatever, everything comes to a stop, sooner or later. Newton's insight is that motion does not just evaporate, it doesn't disappear of its own accord, motion stops because something stops it. Things stop moving because there is some kind of friction or other force which opposes that motion. Whereas, when an object is moving in an environment in which there is no force opposing that motion, it will just keep moving. Inertia is that property which allows motion to continue. Inertia does not just dissipate, it remains, until some other force counteracts it. That is why we say that an object in motion will tend to remain in motion. It does have that tendency, even though in our normal experience, other factors are going to overcome that tendency.
It depends on what body part is moving - you will have to ask your question about a specific motion such as raising your arm or sitting down or whichever movement you are thinking of.