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CRPhysicsCh8Vocab
CRPhysicsChapter8Vocabulary
Question | Answer |
---|---|
the ability of a force to cause an object to rotate about some axis of rotation | torque |
the perpendicular distance from the axis of rotation to a line drawn along the direction of the force | lever arm |
motion that changes an object's position; not the same as rotational motion | translational motion |
point at which all the mass of a body can be considered to be concentrated when analyzing translational motion | center of mass |
the position at which the gravitational force acts on the extended object as if it were a point mass | center of gravity |
the tendency of a rotating object to resist a change in its rotational motion | moment of inertia |
product of a rotating object's moment of inertia and angular speed about the same axis | angular momentum |
energy of an object due to its rotational motion | rotational kinetic energy |
any device that transmits or modifies force, usually by changing the force applied to the object | machine |
combinations of these make up all machines; include lever, pulley, screw, wheel and axle, incline plane, and wedge | simple machine |
used to compare how large the output force is relative to the input force | mechanical advantage |
a measure of how much input energy is lost compared to how much energy is used to perform work on an object | efficiency |