RESISTANCE IN A MECHANICAL SYSTEM

MECHANICAL RESISTANCE

• Mechanical resistance comes in two forms
• The first is drag and the second is friction
• Drag is produced when a solid object moves through a liquid
• Friction happens when a solid object slides against another solid object

FORMULAS FOR RESISTANCE IN A MECHANICAL SYSTEM

• Drag resistance is also known as drag coefficient
• Drag coefficient is found by dividing drag force by rate or (speed of the object)
• Since sliding friction between moving objects doesnt depend on rate, it doesnt obey the general unifying equation

EXAMPLE OF DRAG IN A MACHANICAL SYSTEM

• A jet ski cutting through a lake.

EXAMPLE OF FRICTION IN A MECHANICAL SYSTEM

• Doing a burn out, the friction is your wheels spinning on the pavement

RESISITNCE IN A FLUID SYSTEM

RESISTANCE IN A FLUID SYSTEM

• Fluid resistance is the opposition to the flow of fluids
• Its caused by friction between the molecules making up the fluid and the walls of the pipe/tube
• The longer the fluid has to travel the more reaistances acts apon it

FORMULA FOR A FLUID SYSTEM

• Resistance to fluid motion through a pipe is related to pressure difference
• Across a length of the pipe and the flow rate through the pipe

EXAMPLE OF RESISTANCE IN A FLUID SYSTEM

• A garden hose

EXAMPLE OF RESISTANCE IN A FLUID SYSTEM

• The house pipes to your faucet