PHYS 1P21 Lecture Notes - Lecture 39: Net Force

• School: Brock University
• Department: Physics
• Course: PHYS 1P21
• Professor: Santo D' Agostino

Document Summary

Example: determine the centre of mass for the system of three identical coins. Example: suppose we have two uniform-density bars made of different materials, so that one bar has a mass of 10 kg and the other bar has a mass of 40 kg. The dimensions are shown in the diagram. (a) determine the centre of mass of the two bars considered as one unit. (b) determine the net torque of the weights of the bars about the far left end. Strategy: pretend that the mass of each bar is concentrated at its geometricalcentre. Now let"s look at some examples of bodies in static equilibrium. Example: determine the normal force on each hand and foot, assuming that the person is motionless. The weight of the person is 584 n. Solution: let nh represent the normal force that the floor exerts on each hand, and let nf represent the normal force that the floor exerts on each foot.