PHYS 1A Lecture 5: Lecture 3A choice of coordinate systems
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Can remove time from previous kinematic equations to determine the change in velocity with displacement: From a 10m height you throw ball a up at 5m/s and you throw a ball b down at 5 m/s. When the two balls hit the ground they are going at the same speed. You can figure this out using the previous kinematic equation. 2d is the same as 1d, but twice the fun. Ballistic or projectile motion is an example of constant acceleration motion where the acceleration is due to gravity pointing downwards. week 2 page 1 due to gravity pointing downwards. The vertical does not change even when the horizontal motion changes. Choose a coordinate system aligned with acceleration, gravity vector (eg. x horizontal, y vertical) Substitute values into equations and solve for unknowns (what you want) Time of flight refers to how long a projectile is in the air - depends on y-axis equation and on maximum height of object.
