# Physics Lect 1

 .remove_background_ad { border: 1px solid #555555; padding: .75em; margin: .75em; background-color: #e7e7e7; } .rmbg_image { max-height: 80px; } Special Triangles 3-4-55-12-1330-60-9045-45-90 Displacement vs. Time Graph slope = instantaneous velocityupward = positive velocitydownward = negative velocity (does not nec. mean slowing down)straight line = constant velocitycurved line = acceleration Velocity vs. Time Graph slope = instantaneous accelerationupward = positive accelerationstraight line = constant accelerationcurved line = changing accelerationarea under curve = distance / displacement Projectile Motion: a vertical vs a horizontal Accel Vertical = constant = g = 10m/s2Accel Hori = constant = 0m/s2 Projectile Motion: what dictates the time and the range of the flight path? Vertical Velocity dictates the time of flightHorizontal Velocity * Time dictates the range What angle maximizes range? 45 degrees Mass and Air Resistance Mass changes the effect of air resistance but not the air resistance its selfair resistance has less effect on a more massive objectthink bowling ball to feather Initial Vertical Velocity for Projectiles vsinθ = Vinitial vertical Initial Horizontal Velocity vcosθ = Vinitial horizontalRemember: there is no horizontal acceleration so the horizontal velocity remains constant through the flight path What increases air resistance? more surface areahigher velocities Projectile Motion Equations x - xi = vit + 0.5at2v = vi + atv2 = vi2 + 2axv = sqrt (2gh) *vi must be "0" What acts to shorten the the projectile path? Both gravity and the earth's atmosphere .remove_background_ad { border: 1px solid #555555; padding: .75em; margin: .75em; background-color: #e7e7e7; } .rmbg_image { max-height: 80px; } Authorlaskiru ID58852 Card SetPhysics Lect 1 DescriptionTranslational Motion Updated2011-01-09T23:49:27Z Show Answers