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23 Cards in this Set

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 ------- speed is the distance traveled per unit of time linear A point on the ---------- edge of a merry go round travels a greater distance in one complete rotation than a point ---------- the center. outside; nearer --------- speed involves the number of rotations or revolutions per unit of time. rotational Tangential speed is directly proportional to --------- for any given rotational speed. distance Tangential speed= radial distance X RPM To find radial distance--> 2pi X r/ time Newtons Laws: 1st--> 2nd--> 3rd--> - unless compelled by force - acceleration proportional to net force - equal and opposite force Property of object to resist change rotational inertia The greater the distance between an objects mass concentration and the axis, the greater --> rotational inertia The rotational inertia of any object depends on --. the axis about which it rotates ex: 3 pencils (rotational inertia small with pencil core parallel to length of pencil? Torque tends to --> twist or change the state of rotation of things Both rotational inertia and --------- involve distance from the axis of rotation. torque In the case of torque, the distance, which provides leverage is called the --------- lever arm Torque is the product of this -------- and the force that tends to produce rotation. lever arm The lever arm about any axis of rotation is the ------------ distance from the axis to the line along which the force acts. perpendicular The center of mass of a baseball bat is toward the --------- end. thicker ------------------ is a term popularly used to express center of mass. center of gravity Center of gravity is simply the average position of -------distribution. weight When weight is part of the picture we should favor the term -------------- center of gravity The center of mass of a ring or a hollow sphere is at the --> center where no matter exists If we draw a straight line down from the center of gravity of an object of any shape and it falls ------------- it is in stable equilibrium. (it will balance) inside the base Any force directed toward a fixed center is called --> centripetal force A baseball bat has greater rotational inertia about an axis at its --> light end, where the handle is A condition for mechanical equilibrium is that the sum of the forces acting equal zero. Another condition is that the sum of the --> torques equal zero