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23 Cards in this Set

  • Front
  • Back
measure of total quantity of matter in an object. (the more mass something has the more difficult it is to change its motion)
is a push or pull in a single direction

* types of forces are gravity/weight, friction, tension, hydraulic pressure, torque
force = mass × acceleration
(F = M × A)
{ f = newtons , m = kilograms, a = meters per square unit }
* this law express the relationship between the mass of a moved object or desired acceleration, with the force required to achieve movement.
the rubbing of two objects.
2 types of friction (kinetic & static)
total friction = weight × friction coefficient. an object at rest must experience a large enough applied force to overcome static friction
air resistance or air friction. drag opposes movement through air and water. cross sectional area & speed affect drag.
internal stretch force of a material. tension is measured in N or lbs.
tension is greatest where the force is being applied
Hydraulic Pressure
transmission of force through fluid.
( pressure = force ÷ area )
pressure is measured in psi
(hydraulic force = pressure × area )
* pressure in any part of an enclosed fluid is the same and points in all directions.
* applying force to one end of a hydraulic system will increase the pressure everywhere.
* changing the area over which the force acts can change the strength of the force.
how much a force is able to cause an object to rotate.
(torque = length of level arm × applied force)
torque is measured in newton-meters or ft lb (foot pound)
(Torque force = length of level arm ÷ torque )
mechanical Energy
kinetic & potential energy
Kinetic Energy
Energy of movement. the function of both mass & velocity.
(KE = 0.5 × mass × velocity/speed^2)
mass measured in kilos,
velocity measured meters per second kinetic energy is measured in joules
Potential Energy
energy with the potential to be converted into kinetic energy.
( PE = mass × gravity × height )
gravity = meters per square
height = meters
PE = measured in joules
principal of conservation of mechanical energy
total mechanical Energy = (PE+KE)
PE is equal to KE & KE is equal to PE. so if you can solve one you can solve the other
( work = force × distance)
( work = Kinetic Energy )
work is when force is applied to a object
work measured in joules
force measured in newton's
distance measured in meters
( power = work ÷ time )
power is the rate at which work is done. power measured in watts or horsepower. (1 horsepower) =(746 watts)
Simple Machines
the work output can never exceed the work input.
1. in a gear train, torque & speed are inversely proportional
2. lifting a box to the top of a ramp & pushing a box up a ramp is the same amount of work.
3. some liquids are bad lubricants
mechanical advantage
the amount of force is multiple by a machine
MA = load/ efforts
MA = effort distance/ load distance
whenever force is increased, the distance necessary will decrease.
( 1st class LEVERS )
simple machines
2nd class LEVER
3rd class lever
laws and formulas 2
Water Pressure
* total flow through a pipe is the same everywhere.
* when liquid speeds up, pressure falls
* when liquid slows down, pressure rises