Notes

Outline

Technical Physics 1 Newton’s 2nd Law

F = m · a English Units pounds for force slugs for mass ft/sec2 for acceleration 1lb. = 1 slug·ft/s2 Metric Units newtons for force kilograms for mass m/sec2 for acceleration 1N = 1 kg·m/s2

Weight vs. Mass Weight - the force due to gravity Mass - the amount of matter

Problem Solving SFx = m·ax SFy = m·ay Ff = m·N

Horizontal

Incline

Single object  lifted vertically T - W = m ·a

Systems of objects connected together W1 - W2 = (m1 + m2)·a  W1 - T = (m1)·a  T - W2 = (m2)·a

Systems of objects connected together with friction W1 - Ff = (m1 + m2)·a  W1 - T = (m1)·a  T - Ff = (m2)·a