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# Ch3 2-d kinematics notes

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Velocity and Acceleration

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### Ch3 2-d kinematics notes

1. 1. 2-Dimensional Motion Horizontal Vertical What affects the ball?The only thing to affect Gravity! (Nothe ball is friction, and we friction)don’t look at that! g = -9.8m/s2 Velocity is alwaysconstant!
2. 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. 3. Type I: An object is droppedstarting at rest from a vertical height Notice the object has only vertical velocity which gradually increases.
4. 4. Type II: Object has a horizontal velocity before it falls.It travelsHorizontallyandVertically asit falls.
5. 5. Type III: A perfect parabolaNoticethe xvectorneverchangessize butthe yvectordoes.
6. 6. Type III Continued: Perfect ParabolaThe objectleaves theground andlands at thesame level.The y velocityis zero at thetop of the arc.
7. 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. 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.