KIN 151 Lecture Notes - Lecture 18: Tightrope Walking, Dynamic Equilibrium, Bet Her
Document Summary
To describe the concept of center of gravity. To revisit some of our quantitative problem-solving steps. A force applied to a system causing rotation. A simple machine that can multiply the mechanical force that can be applied to another system. The effectiveness of the lever is determined by: The ratio of the force arm to the resistance arm. A force can balance a larger resistance when the force arm is longer than the resistance arm. A force can move a resistance through a large range of motion when the force arm is shorter than the resistance arm. Expresses the mechanical effectiveness of the lever. Mechanical advantage = force arm / resistance arm. Levers can serve one of two purposes. Lever is built speed (ma < 1) Lever is built for strength (ma > 1) Weights cannot be added in a lever system.
