| Questions | 5 |
| Topics | Block and Tackle, Force Lines of Action, Force of Friction, Mechanics, Net Force |
Two or more pulleys used together constitute a block and tackle which, unlike a fixed pulley, does impart mechanical advantage as a function of the number of pulleys that make up the arrangement. So, for example, a block and tackle with three pulleys would have a mechanical advantage of three.
Collinear forces act along the same line of action, concurrent forces pass through a common point and coplanar forces act in a common plane.
The formula for force of friction (Ff) is the same whether kinetic or static friction applies: Ff = μFN. To distinguish between kinetic and static friction, μk and μs are often used in place of μ.
Mechanics deals with motion and the forces that produce motion.
In mechanics, multiple forces are often acting on a particular object and, taken together, produce the net force acting on that object. Like force, net force is a vector quantity in that it has magnitude and direction.