Several problems with solutions and detailed explanations on systems with strings, pulleys and inclined planes are presented. Free body diagrams of forces, forces expressed by their componentsand Newton’s laws are used to solve these problems. Problems involving forces of friction and tension of strings and ropes are also included. A block of mass 5 Kg is suspended by a string to a ceiling and is at rest.
Find the force Fc exerted by the ceiling on the string. Assume the mass of the string to be negligible.The free body diagram below shows the weight W and the tension T1 acting on the block.
Tension T2 acting on the ceiling and Fc the reaction to T2. Hence action reaction (Newton’s 3 rd law) : |Fc| = |T2| We now consider the forces acting on the block (Free Body Diagram)
In the figure below is shown the system below are shown two blocks linked by a string through a pulley, where the block of mass m1 slides on the frictionless table.