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Terms in this set (37)
a push or pull
the speed and direction of an object
a change in velocity
Formula To Determine Force
Acceleration (F= M
3rd Law in physics
states that for every action (force) in nature, there is an equal and opposite reaction
both have a magnitude (size) and a direction associated with them
an object is at rest, or is stationary
is the measurement of force over an area. it is usually measure in pounds per square inch (PSI)
Formula for Pressure
Pressure= Force(in pounds)/Area (in inches) ex: P=50lbs/10in
a gauge that measures atmospheric pressure. normal atmospheric pressure is 14.7 PSI
resistance to motion of two objects or surfaces that touch
the physical property that draws objects towards the center of the earth (and other object that have mass)
the property of attracting iron or steal
the property of kicking back when released.
the production of stationary electrical charges. often the result of friction.
Universal Law Of Gravity
states that every point mass in the universe attracts to every other point mass with a force that is directly proportional to the product to their masses and inversley proportional to the square of the distance between them.
the force transmitted through a rope, string or wire when force is applied to both ends. The force is the amount of tension directed along the rope, string or wire and pulls equally on the objects at both ends. this is usually measured in either pounds-force
if you exert force on a solid shape it responds by exerting a force in the opposite direction.
occurs when a force moving over a measurable distance overcomes a resistance. the unit of measure for work in the U.S. is a foot-pound. formula : Work= force
distance or W= F
is the rate of work. formula Power= Work/Time or P= W/T
measured in horsepower
dervived from the estimate that an average horese can do 33,000 foot-pounds of work in one minute according to james watt. 1 horsepower is equal to 33,000 foot-pounds per minute.
provided you with the ability to magnify and change the direction of forces.
occurs when a machine multiplies the force you use this concept can be stated as Mechanical Advantage= Resistance/Effort= Output force/Input force
used to help increase force. all levers work by using a fulcrum(point of support) to reduce resistance and multiply the effect of effort. resistance is excerted at one end of the lever (resistance arm) and effort is exerted at the other (effort arm). the effort arm moves the resistance arm. Formula Length of effort arm/length of resistance arm=resistance force/effort force
Mechanical Advantage of using a lever
Mechanical Advantage= effort arm/resistance arm
a simple machine that makes moving an object from one point to another easier. it spreads you work out over a longer distance, so less force is needed to do the work. Length of ramp/height of ramp= weight of object moved/force required to move object
are a form of an inclined plain and can multiply your effort in much the same way as th ramp can
Pulleys and Gears
simple machines that can be used to change the magnitude and direction of force
Block and Tackle Arrangement
Pulley's make lifting heavy objects easier. in this system pulley's can also be used to change the direction of your pull
Function of gears
machines often use gears to transmit motion from one place to another
can be used to change direction, increase, decrease speed, or increase force.
can be used to connect gears that have shafts at different angles
used to transmit motion from one location to another. connected in a series that rotates in the same direction. speed of rotation depends on the diameter of the pulley in relation to the diameter of the pulley that is driving it.
Wheel and Axel
machine that multiplies the effort you use, producing greater force
Pitch of the thread
the distance between the ridges of the spiral on a vise
uses a nearly incompressible liquid, such as oil to exert force in order to move an object. As the handle moves it applies pressure to the oil. because the oil doesn't compress the oil transmits whatever force is applied to it to the work cylinder with no or little loss in efficiency
THIS SET IS OFTEN IN FOLDERS WITH...
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