Velocity & Acceleration
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Transcript of Velocity & Acceleration
Velocity & Acceleration
BTW you have a Test Thursday September 4th
Velocity
• Both the speed and direction of an object
Speed: A car travels 60km/h
Velocity A car travels 60km/h to the north
WITH DIRECTION
Vector
• Quantities that are fully described by both a magnitude and a direction.
• Force is a vector quantity – it has magnitude and direction
• Velocity is too! It has both magnitude and direction
Scalar
• Quantities that are fully described by a magnitude (or numerical value) alone
• Speed – only has magnitude
Let’s Play Vector or Scalar!
• You just picked up some fellow classmates at chic-fil-a in your new rockin’ sharkmobile. You make the 1 mile drive to CTA for some fun after school learning with Ms. Meyer.
Vector or Scalar?
• You are headed to an Ohio State football game. You bike all 13.8 miles North East to campus.
Vector or Scalar?
• You are standing at the CTA girl’s basketball game. You go nowhere. You want to cheer for your team!
Vector or Scalar?
Constant Velocity
• Remember constant speed? Well this is the same thing but with velocity (a direction)
• Well if there is a direction, and it’s constant, then there has to be a constant direction!
Changing Velocity
• If either the speed or the direction changes (or both) then the velocity changes
• A car on a curved track may have a constant speed but, because its direction is changing, its velocity is not constant. – We will see in the next section that it is accelerating
Acceleration
• So we can change the velocity of something by changing its speed, direction or both
• How quickly velocity changes is acceleration
Acceleration Formula
Or
Acceleration Example
1) A particular car can go from rest to 90 km/h in 10s. What is its acceleration?
A = v-vo/time interval
A = 90-0 / 10s = 9km/h*s
Bozeman Science is the Bomb.com(a little like jmeyerscience.weebly.com)
Bozeman Science - Speed, Velocity, Acceleration
Practice
• Ch. 3 Review Questions pg. 46– # 10, 11, 14
• Ch. 3 Plug & Chug pg. 47– # 10,