Some hints - What to use when: RIGID BODIES When you are...

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What to use when: RIGID BODIES When you are given the MI (through radius of gyration) and geometry of the body, you must use rigid body mechanics, especially if the body is in plane motion or rotation. 1. You will most certainly need to use kinematics in nearly all the problems (along with kinetics, principles of work/energy, and principles of linear/angular momentum equations need to be applied). In general, if you get more unknowns than the number of equations, you should attempt using kinematics (v=r ω , a = r α , relative velocity and relative acceleration equations, etc.). 2. Use kinetics ( F x , F y , and M o ) if accelerations and angular accelerations are involved. In such cases, apply M o first, as it usually gives angular acceleration first. You may have to use kinematics in the process (such as that for a t and a n ). If you need any other forces, you will then apply the force equations. Note that you will need to use the relative acceleration equation if the body is moving (rotating, usually) with respect to another accelerating body. If there are any
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Some hints - What to use when: RIGID BODIES When you are...

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