1. BELLWORK -Essential items out
-NB: Write “IN” and today’s date. Answer the following in complete sentence(s):
m/s/s C! is a unit for acceleration

2. Which one represents an acceleration vector?
Checking your math knowledge applied to acceleration:
Which represents the greatest and least acceleration?
a m/s
b cm/s/s
c km/s/s south
d km/s/s
– m/s is not acceleration – it is speed (S squared); b. cm! Too small, C is 50m/s/s and D is 5m/s/s
Which one represents an acceleration vector?
Which one represents an acceleration vector?

3. “Through” Acceleration as a vector
VECTOR – a quantity with both magnitude/size and direction.
Acceleration is a type of vector because it is the rate of change of velocity which includes both speed and direction.
(Speed is the magnitude)
A VECTOR is a QUANTITY includes magnitude/size (SPEED) and direction. Acceleration and Velocity are both examples of vectors because they have both magnitude (SPEED) and DIRECTION.

4. “Through” Acceleration as a vector
Acceleration is:
1. Increase in speed
2. Decrease in speed
3. Change in direction
4. Change in both speed and direction

5. Types of Acceleration due to Changing Speed
1. Positive Acceleration –Increasing speed
(going from a low velocity to a high velocity)
2. Negative acceleration – Decreasing speed
(going from a high velocity to a low velocity)
negative or deceleration;

6. Acceleration due to Changing Direction
even without an increase or decrease in speed
How can a car be accelerating if its speed is a constant 65 km/h? If it is changing directions it is accelerating!
changing direction is still called an acceleration even without an increase or decrease in speed. Simply turning.
4. Change in both speed and direction

7. What about an object constantly changing direction
What about an object constantly changing direction? (Turning in a circle)
This is called centripetal acceleration
It always experiences acceleration.
Acceleration in a circular motion is called centripetal acceleration.

8. ACCELERATION VECTORS Increase in speed Decrease in speed velocity
Same direction = increased speed. Opposite direction =decreased speed (If a car travels in a straight line then driver applies the brakes and stops.) The acceleration vectors point in opposite directions

11. Number 1 is an example of POSITIVE ACCELERATION

13. OUT
An example of positive acceleration is ________________________. An example of negative acceleration is ________________________. An example of centripetal acceleration is ____________________________.