Acceleration

A vector quantity that is defined as the rate at which an object changes its velocity. An object is accelerating if it is changing its velocity.



Constant Acceleration: Velocity is changing at a constant amount each second


Formula- A= (Vf - Vi)/(time)


Since acceleration is a vector quantity, it has a direction associated with it. The direction of the acceleration vector depends on two things:

  • whether the object is speeding up or slowing down
  • whether the object is moving in the + or - direction

Units:

  • m/s/s
  • ml/hr/s
  • km/hr/s
  • m/s^2


Questions:

1. The rocket that Carol made for her art project can go from 0-200 meters in 10 seconds, what is the acceleration of the rocket?


2. If a car goes from rest to 15 m/s in 3 seconds, what is the acceleration?


3. True or false? Acceleration can be negative


4. What is it called when an object's velocity is changing at a constant amount?


1. 20 m/s, 2. 5 m/s 3. True. 4. Constant acceleration



Big image