friction and impacts Flashcards
1
Q
what is the maximum value of frictional force directly proportional to?
A
the roughness of the surfaces in contact and the reaction force
2
Q
when will an object start sliding?
A
when the limit of the frictional force has been overcome
3
Q
what is friction?
A
a force acting at the surface between two objects
4
Q
what does the coefficient of friction depend on?
A
the roughness of the surfaces in contact
5
Q
what is reaction force equal to?
A
the objects weight
6
Q
what is friction dependent on?
A
mass - greater frictional force due to greater reaction force
7
Q
what is an impact?
A
two or more bodies exerting relative large forces on one another when colliding
8
Q
what is the coefficient of restitution?
A
it describes the relative elasticity of an impact
