AP Physics B B

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"30 Seconds with Mr. G" - Number 4

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IV. Motion Equations for Problem Solving

 

 

When an object is moving at a constant acceleration we can use the following equations
 to find motion information

 

 

A. Constant accel. Equations
         (see Reference Table)

 

 

1. Average Velocity

 

As AP students you will need to memorize
all the constant accel. motion equations

 

 

V = ?

or

V = ?

 

 

 

 

 

V = (Vi + Vf)/2

 

 

or

 

V = Δd/Δt

 

 

 

 

2. Acceleration?

 

 

 

 

 

a = (Vf - Vi)/t

 

 

Cross multiply & Solve 

 

at = (Vf - Vi)

 

Add Vi to both sides

 

Vf = Vi + at

 

 

 

 

3. Displacement:

Δd = Vit + .... ?

Δd = Vit +1/2at2

 

4. Final Velocity?

 

 

 

Vf2 = ....

 

 

 

Vf2 = Vi2 + 2aΔd

 

 

 

 

 

 

 

 

 

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