AFOQT mech

something that can change the velocity of an object

alway acts in the opposite reaction as to retard relative motion

when two objects are in close contact

measures friction

is a unti of force which is 4.45N=1lb

when an object is at equilibrium all forces acting on it are equal to zero

depends more on the pressure between two surfaces rather than velocity

when a solid mass passes thru a liquid, gas or air vicous drag will occur. Viscous drag will increase as speed increases. 

• - aerodynamic shapes come in to play
• -properties of the fluid also come into play

weight is equal to MG; mass x gravity

when you applhy pressure on a solid object, that object will bend but also push back with a force equal to one exerted on it.

tension can be measured by cutting a rope and introducing a spring scale

buoyancy acts in an upward direction on anything submerged in a liquid or gas.

An object with a weight greater than the booyancy of the fluid it is in will sink.

forces exist only in pairs

• these are 
• 1. lever
• 2. incline plane
• 3. pulley
• 4. wedge
• 5. wheel and axle
• 6. screw

work is the force applied over a distance

Output ratio to inout ratio of work produced by a machine

whenever a force moves something over a distance. W=FxD

Force required to move 1 kilogram one meter in one second.

1kg x m/s

MA = Fl/Fe = load/effort

the force that actually produces horizontal movement when a force is appled at an angle.

ME= Wout/Win = work put out / work put in

a Force with both magnitude and direction

FeDe = FlDl 

• MA= Fl/Dl
• MA = Re/Rl

• there are 3 types. 
• class 1- fulcrum between effort and load; dolly

class 2- Fulcrum on one end, with load between; wheel barrow, nutcracker

class 3- Effort in the middle of load and fulcrum; fisherman, tongs

plane set at and angle

MA = lenght / height

• Woutput = load x height
• Win= Force x lenght of ramp

A double inclined plane that moves to exert a force along the lenght of its sides to push two objects apart

-knife, ax, chisel

wheel and axle

can be thought of as an inclined plane with a wedge wrapped around a cylinder. 

forces are applied perpendicular to the groove

the pulley uses the principle of applying force over a longer distance. It also uses tension in the rope or cable. 

De = Dl x supporting strands

E = Load / number of strands

W = F x D

liquids are nearly incompressible. 

MA = Al / Ae

Aii / Ai = Di / Dii 

• Aii = diameter of larger circle
• Ai = smaller
• Di= Vertical distance of smaller
• Dii=Larger one

MA = # of teeth in load gear / # of teeth in effort gear

• 1 ft-lb/s = 550 hp
• 746 joules = 1 hp