key terms pt 1

axis

straight line around which an object spins

rotation

spinning motion when turning about an internal axis

revolution

spinning motion when turning about an external axis

radial distance

distance from the axis to an object rotating about that axis

linear speed

scalar, how fast an object is moving

tangential speed

scalar, speed of an object moving along a circular path perpendicular to the radial distance (linear speed)

angular speed

scalar, number of revolutions per unit time

centripetal

center seeking; toward the center

centripetal acceleration

acceleration toward the center of circular motion

tangential acceleration

acceleration vector that points along a straight line tangent to the circle while an object is spinning

angular dispacement

angle through which a rigid object rotates about a fixed axis (theta)

average angular acceleration

angular acceleration; going in a circle acceleration; ratio of change in angular velocity to time interval; rate at which spinning motion is speeding up or slowing down (alpha)

centripetal force

for perpendicular to the path of a moving object that produces circular motion; center-directed force that causes an object to move in a circular pass

centrifugal

center fleeing; away from the center

centrifugal force

apparent outward force on a rotating or revolving object (not real)

g force

not actually forces; a reference to the feeling experienced under a certain amount of acceleration

center of gravity

point at the center of an objects's weight distribution where gravity is considered to act; found at the geometric center; same as tje center of mass for small objects

center of mass

point at the center of an objects mass distribution where all of its mass is considered to be concentrated; found at the geometric center; same as center of gravity for small objects

topple

to fall in a circular path or rotate; occurs due to a torque

average angular velocity

angular velocity; going in a circle speed; ratio of change in angular displacement to time interval (omega)