Ch3 2-d kinematics notes
- 1. 2-Dimensional Motion Horizontal Vertical What affects the ball? The only thing to affect Gravity! (No the ball is friction, and we friction) don’t look at that! g = -9.8m/s2 Velocity is always constant!
- 2. Combine Horizontal and Vertical components are independent! the two (They don’t affect each other. It doesn’t matter how fast the object is going in the x direction, gravity still acts evenly on the object in the y direction. So … all these problems are 2 problems: one problem in the y direction, one problem in the x direction. time is what combines the two.
- 3. Type I: An object is dropped starting at rest from a vertical height Notice the object has only vertical velocity which gradually increases.
- 4. Type II: Object has a horizontal velocity before it falls. It travels Horizontally and Vertically as it falls.
- 5. Type III: A perfect parabola Notice the x vector never changes size but the y vector does.
- 6. Type III Continued: Perfect Parabola The object leaves the ground and lands at the same level. The y velocity is zero at the top of the arc.
- 7. Type IV: An object is launched at an angle from a vertical height. Rules: The x velocity will never change. The Vy at the top is still zero. The final velocity is greater than the initial Velocity.
- 8. Some vocabulary terms: 3.Projectile: anything that flies through air. Could be a ball, dart, bullet, person, etc. 7.Trajectory: the path a projectile takes. Could be a parabola, or an arc, etc. 11.Parabolic shape: the shape of a parabola.