Forces and Motion Ch. 12 Intro to Physics

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

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

Newton’s 1st 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 2nd 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 3rd 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 Nuclear Electric Magnetic Strong Weak Protons and neutrons Short distance Weak Weaker and shorter

Gravity Long distance Orbit Centripetal Force Tides