Simple machine

**Historical Development of Simple Machines:**
– Originated with Archimedes in 3rd century BC.
– Archimedes studied the lever, pulley, and screw.
– Greeks defined the classic five simple machines.
– Galileo Galilei developed the dynamic theory of simple machines in 1600.

**Characteristics of Ideal Simple Machines:**
– Conserves energy with power input equaling power output.
– Mechanical advantage calculated from geometric dimensions.
– Simple machines do not contain a source of energy.
– Power output in an ideal machine equals load force multiplied by load velocity.

**Friction and Efficiency in Machines:**
– Friction causes dissipation of input power as heat.
– Impact of friction on the efficiency of machines.
– Ideal machines do not dissipate energy through friction, wear, or deformation.

**Compound Machines and Mechanical Advantage:**
– Formed from simple machines connected in series.
– Output force of one machine provides input force to the next.
– Compound machines amplify force by using multiple simple machines.
– Mechanical advantage of a compound machine is the product of the mechanical advantages of the simple machines it is composed of.

**Modern Machine Theory and Kinematic Chains:**
– Machines are mechanical systems with actuators, mechanisms, sensors, and controllers.
– Actuators and mechanisms consist of links and joints forming kinematic chains.
– Kinematic chains model systems from steam engines to robot manipulators.
– Classification of machines based on assembling parts connected by joints.