I. Changing Motion An object speeds up or down.

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Presentation transcript:

I. Changing Motion An object speeds up or down. What would the d vs. t graph look like? Curved.

A. Velocity vs. Time On a velocity vs. time graph, the slope is equal to the acceleration. Acceleration is the change in velocity over time. Can change in speed, direction, or both

B. Types of Acceleration Positive = speeding up Negative = slowing down or going in the opposite direction Zero = no change. Constant velocity +, -, or zero acceleration corresponds to the slope on the v vs. t graph.

C. Formulas (also called Kinematic formulas) a = vf - vi t vf = vi + at Δd = vit + ½ at2 (remember Δd = xf - xi ) vf2 = vi2 + 2aΔd ( or Δd = Δx )