Acceleration. Bell work 0 Larry rolls a marble down a ramp. The marble travels 0.5m in 0.25s. What is the marbles average speed?

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Presentation transcript:

Acceleration

Bell work 0 Larry rolls a marble down a ramp. The marble travels 0.5m in 0.25s. What is the marbles average speed?

∆v= v f -v i Velocity (m/s) ∆t=t f -t i Time (s) a a= ∆v ∆t Acceleration SI unit: (m/s 2 )

Key points:  Vector quantity  Caused by change in speed, direction or both

Acceleration 0 The speed 0 when velocity and acceleration 0 Go in the same direction 0 The speed 0 when velocity and acceleration 0 Go in opposite directions © 2014 Pearson Education, Inc.

Types of acceleration 0 Average: change in velocity divided by change in time 0 Instantaneous: acceleration at a specific instant 0 Constant: same at every instant of time

Notebook Quiz 1 1. How many items do you have on your table of contents? 2. How many note cards do you have for chapter 2&3 vocab? 3. Speed & Velocity notes: 1. Show me the GUESS method for problem What is the formula for Speed? 5. What does GUESS stand for?