FORCES AND MOTION Ch 12 Intro to Physics

FORCES AND MOTION Ch. 12 Intro to Physics

Forces • Force? • Vector? • Newton (N) • Net Force • Balanced Forces • Unbalanced Forces • Friction • Static • Sliding • Less than static

Forces • Rolling • 100 -1000 times less than static or sliding • Ball bearings • Fluid • Air Resistance • Aerodynamics • Gravity • Falling objects • Forces? • Terminal Velocity • Projectile Motion

Newton’s 1 st Law • Every object continues in a state of rest, or of motion in a straight line at a constant speed , unless it is compelled to change that state by forces exerted upon it. • Inertia • Seatbelts • Airbags • Axe head • Tablecloth

Newton’s 2 nd Law • The acceleration produced by a net force on an object is directly proportional to the magnitude of the net force, is in the same direction as the net force, and is inversely proportional to the mass of the object. • Mass • Inertia • Matter • Weight • Calculate • changes • Ex • Page 367 • 1 and 3

Newton’s 3 rd Law • Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first object. • Action and reaction forces • Do not cancel

Momentum • Inertia in motion • Mass and velocity • Conservation of momentum • P. 376 • P. 377 • Data Analysis

Universal Forces

Universal Forces • Electromagnetic • Electric • Magnetic • Nuclear • Strong • Protons and neutrons • Short distance • Weaker and shorter

Gravity • Long distance • Orbit • Centripetal Force • Tides