The fact that it acts opposite to the direction in which the other forces would, collectively, accelerate the object explains the statement of property 1. Hence, there must be some other force in the horizontal direction that is directed opposite my push and has exactly the correct magnitude to cancel my push’s effect. Thus the book’s acceleration is zero, and from Newton’s First (or Second) Law we know that the forces on the book must sum to zero. If I push lightly enough the book doesn’t move. Now I push lightly on the book in a direction parallel to the table top. Similar to kinetic friction, μ S is called the static friction coefficient and is determined entirely by the nature of the materials in contact.Īn example should make both these properties clearer. Below we’ll denote this threshold value as ƒ s,=μ S| F N|. Property 2 can be stated in words as the magnitude of the static friction force is always less than or equal to a threshold value given by μ S| F N|.
0 Comments
Leave a Reply. |