Physics 2065A/B Study Guide - Midterm Guide: Rolling Resistance, Elastomer, Inelastic Collision
Document Summary
Velocity is vector, speed is scalar; vectors have direction!!! Use vector diagrams to identify forces; free body diagrams. Average speed, change in displacement over time, measured m/s or km/h. Average acceleration, change in average speed over time, measured m/s . N2 (law of acceleration/force/motion): net force on object is equal to the product of the mass and acceleration of the body (ma is fnet); empirical formula relating acceleration and force. Gravity as a force: downward force that pulls an object toward the centre of the earth due its mass; n2: Fy= mg where g is 9. 8m/s (acceleration due to gravity; magnitude of this force is called weight) Kinetic friction: once body starts moving; static friction becomes kinetic friction (fk) Galileo"s hypothesis regarding drag force and terminal velocity: all objects fall with the same velocity in the absence of air resistance.