Physics Lect 1

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Special Triangles
- 3-4-5
- 5-12-13
- 30-60-90
- 45-45-90
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
Velocity vs. Time Graph
- slope = instantaneous acceleration
- upward = positive acceleration
- straight line = constant acceleration
- curved line = changing acceleration
- area under curve = distance / displacement
Projectile Motion: a _verticalvs a _horizontal
- Accel Vertical = constant = g = 10m/s²
- Accel Hori = constant = 0m/s²
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
What angle maximizes range?

45 degrees
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
Initial Vertical Velocity for Projectiles

vsinθ = V_{initial vertical}
Initial Horizontal Velocity
- vcosθ = V_{initial horizontal}
- Remember: there is no horizontal acceleration so the horizontal velocity remains constant through the flight path
What increases air resistance?
- more surface area
- higher velocities
Projectile Motion Equations
- x - x_i = v_it + 0.5at²
- v = v_i + at
- v² = v_i² + 2ax
- v = sqrt (2gh) *v_i must be "0"
What acts to shorten the the projectile path?

Both gravity and the earth's atmosphere

Author

laskiru

58852

Card Set

Physics Lect 1

Description

Translational Motion

Updated

2011-01-09T23:49:27Z

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