Kinematic Equations - Currituck County Schools

Kinematic Equations - Currituck County Schools

Kinematic Equations Motion with Uniform Acceleration Kinematic Equations Relationships between displacement, velocity, acceleration, and time Only work when acceleration is uniform (constant)!! Kinematic Equations All equations derived from three relationships that you already know:

v avg v f vi 2 v avg x t a avg

v t Equation #1 Final Velocity with Constant Acceleration Start with aavg = v/t Rearrange and solve for vf vf = vi + a(t) Dont need to know displacement Equation #2

Displacement knowing Change in Velocity Start with the two equations for vavg Set them equal to each other Solve for x x = (vi + vf)t Dont need to know acceleration Equation #3 Displacement from Initial Velocity and Acceleration Start with first two kinematic equations Substitute expression for vf from #1 into equation #2

Simplify and solve for x x = vi(t) + a(t)2 Dont need to know final velocity Equation #4 Final Velocity from Initial Velocity and Acceleration vf2 = vi2 + 2a(x) Dont need to know time Equation

vf vi a x t x = (vi + vf)t

vf = vi + a(t)

x = vi(t) + a(t)2 vf2 = vi2 + 2a(x) Solving Problems Using Kinematic Equations 1. Determine what the question is asking for

2. List all known quantities Remember, each equation contains four variables, so you need to know three variables in order to solve for the fourth 3. Pick the appropriate equation 4. Solve for desired quantity

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