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physics test 3 terms


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copy deck
is the act of exerting a force through a distance in the direction of the force.
Work –
the ability to do work because of position in a force field.
Potential Energy –
the ability to do work because of motion.
Kinetic energy -
Total energy of a system is always constant, although energy changes from one form to another may occur within the system.
Conservation of Energy –
The total momentum before impact is equal to the total momentum after impact. [ pi1 + pi2 = pf1 + pf2 ]
Conservation of momentum
The rate at which work is done or energy is used.
Power –
USCS unit used for measuring mechanical power.
Horsepower –
The SI unit for measuring power.
Watt –
change in momentum.
Impulse ( F∆t)
The quantity of motion.
Momentum (p)
an acceleration towards the center of a circular path.
Centripetal Acceleration
is the inward force necessary to maintain uniform circular motion.
Centripetal Force –
∆X / time
Linear speed
∆θ /time
Angular speed (rotational) –
The number of complete cycles of a periodic process occurring per unit time.
Frequency –
The time interval between two successive occurrences of a recurrent event or phases of an event.
a unit of measure for angular displacement. A ratio of the arc distance to the radius.
the amount change in angular position.
Angular Displacement
the time rate of change in angular speed.
Angular Acceleration (α)
angle required to eliminate frictional force.
Banking Angle
the amount of force necacary to move an object through an angular distance.
Rotational Work
the rate at which rotational work is done.
Rotational Power
any device that multiplies, divides, or changes direction of a force.
Force out X
Work out Force in X AMA
--------- = ------------- = ------
Work in Distance out IMA
Distance in
consist of any rigid bar pivoted at a certain point called the fulcrum.
Mi = (Fo / Fi ) = ri / ro
A simple machine consisting essentially of a wheel with a grooved rim in which a pulled rope or chain can run to change the direction of the pull and thereby lift a load.
Mi = (Fo / Fi ) = xi / xo
A toothed wheel, that meshes with another toothed wheel to transmit motion or to change speed or direction.
Mi = No / Ni = Do / Di
A piece of material, such as metal or wood, thick at one edge and tapered to a thin edge at the other for insertion in a narrow crevice, used for splitting, tightening, securing, or levering.
Mi = L/t
a simple machine of the inclined-plane type consisting of a spirally threaded cylindrical rod that engages with a similarly threaded hole.
Mi = si / so = 2ϬR/p
To set at a specified downward slant.
a simple machine for elevating objects; consists of plane surface that makes an acute angle with the horizontal
Mi = (W / Fi ) = s/h
Inclined plane
A simple machine consisting of an axle to which a wheel is fastened so that torque applied to the wheel winds a rope or chain onto the axle, yielding a mechanical advantage equal to the ratio of the diameter of the wheel to that of the axle.
Mi = (F
Wheel and axle
ratio of the output force to the input force.
Actual mechanical advantage
ratio of the distance the input force moves to the distance the output force moves.
Ideal mechanical advantage
any mechanism in which power is transmitted by a continuous flexible belt
Mi = (Do / Di ) = wi / wo
Belt drive

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