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Positive torque causes counter-clockwise CCW rotation. Negative torque causes clockwise (CW) rotation. If several torques are applied, the net torque causes angular acceleration: net Aside: Torque, like force, is a vector quantity. Torque has a direction. Definition of vector torque: rF = cross product of r and F: "r cross F"
Understand the relationship between force, mass and acceleration. Study the turning effect of force. Study the analogy between force and torque, mass and moment of inertia, and linear acceleration and angular acceleration.
Calculate the torque of a specified force about an arbitrary origin. Calculate the angular momentum vector for a moving particle. Calculate the angular momentum vector for a rotating rigid body in simple cases where this vector lies parallel to the angular velocity vector.
F=ma for rotation: t=Ia. Use F=ma, t=Ia to solve for a, a, tension, time. Use conservation of energy to solve for speed. Can choose any axis or pivot around which to compute torques. Trick of the trade: If there is a force on the pivot, the torque it produces is 0!
In this chapter we will investigate how the combination of force (F) and the moment arm (‘) e ect a change in rotational motion (i.e., rotational angular acceleration, ˝ = force moment arm (de nition of torque)
Topics: On this worksheet you will practice using the basic formulas for torque and subsequent rotational behavior.
Find the rotational inertia (I) of two 5-kg point masses joined by a 1-m rod of negligible mass when rotated about the center of the rod. Compare this to the I of the two object system
