friction

Static Fiction is set in stone by the original author. Any work where the author is known, and the manuscript is well established.

Dynamic Fiction changes over time, like folk stories, tall tales, and most mythology.

thank you soooo much anything else i should know

These terms just refer to friction of of a stationary object vs that of a moving, usually sliding, object. There is also rolling friction. I think a pair of objects slding against each other always have a higher coefficient of static than of sliding friction.

but is that the only difference between them

Brandon is right. That is the only difference between them.

But it is a big difference.

Static friction happens between two objects that are not moving against each other. It will provide just enough force to resist a force you put on the object. The number given for static friction is a limit. It is the highest force you can put on an object before it start moving.

Think of a book on a table. It let's say it has 6N of static friction, but you are not pushing on it.

Consider when you are not putting any force on the book. Clearly the friction is not putting 6N of force on the book, if it were there would be an unbalanced force and the book would start moving.

What this does mean is that if you put up to 6N of force on the book, the book will not move. If you put a force on the book, the friction provides just enough force to keep the book from moving. Of course, once you pout the limit, the friction is "broken" the book starts moving and static friction no longer applies.

Dynamic friction is the friction between two moving objects. Unlike static friction, Dynamic friction is just a force. Imagine you have an object that is moving and you are not putting any force on it. Let's say that it has 5N of dynamic friction. This friction is a force that is opposing the motion. This means that the object will slow down according to Newton's 2nd law.

So Static Friction is a quite different concept from Dynamic Friction.

Static friction is a limit, it provides enough force to keep from moving ... but the actual force depends on the force you are putting on it.

Dynamic friction is just a force. It provides a constant force to slow down an object regardless of whether you are pushing of pulling it.

u r great thanx guys

:-)

:-)

Just chiming in my two cents, but there is a relationship between the two. Usually an objects Dynamic frictional force will be slightly less than the static frictional force (i.e. it's harder to get something to start moving than it is to keep it moving!)