# Physics Lect 1

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1. Special Triangles
• 3-4-5
• 5-12-13
• 30-60-90
• 45-45-90
2. Displacement vs. Time Graph
• slope = instantaneous velocity
• upward = positive velocity
• downward = negative velocity (does not nec. mean slowing down)
• straight line = constant velocity
• curved line = acceleration
3. Velocity vs. Time Graph
• slope = instantaneous acceleration
• upward = positive acceleration
• straight line = constant acceleration
• curved line = changing acceleration
• area under curve = distance / displacement
4. Projectile Motion: a vertical vs a horizontal
• Accel Vertical = constant = g = 10m/s2
• Accel Hori = constant = 0m/s2
5. Projectile Motion: what dictates the time and the range of the flight path?
• Vertical Velocity dictates the time of flight
• Horizontal Velocity * Time dictates the range
6. What angle maximizes range?
45 degrees
7. Mass and Air Resistance
• Mass changes the effect of air resistance but not the air resistance its self
• air resistance has less effect on a more massive object
• think bowling ball to feather
8. Initial Vertical Velocity for Projectiles
vsinθ = Vinitial vertical
9. Initial Horizontal Velocity
• vcosθ = Vinitial horizontal
• Remember: there is no horizontal acceleration so the horizontal velocity remains constant through the flight path
10. What increases air resistance?
• more surface area
• higher velocities
11. Projectile Motion Equations
• x - xi = vit + 0.5at2
• v = vi + at
• v2 = vi2 + 2ax
• v = sqrt (2gh) *vi must be "0"
12. What acts to shorten the the projectile path?
Both gravity and the earth's atmosphere
 Author: laskiru ID: 58852 Card Set: Physics Lect 1 Updated: 2011-01-09 23:49:27 Tags: Translational Motion Folders: Description: Translational Motion Show Answers: