Speed and Velocity Distance Time Average Velocity Displacement

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Speed and Velocity • Distance / Time

Speed and Velocity • Distance / Time

Average Velocity • Displacement / time

Average Velocity • Displacement / time

 • What is the average velocity of a person who walks 30 meters

• What is the average velocity of a person who walks 30 meters east, then 10 meters west in 100 seconds? 30 meters 10 meters Displacement = 20 meters Average Velocity = 20 meters / 100 seconds Average Velocity = 0. 2 m/s

When you’re going somewhere, do you always go the same speed?

When you’re going somewhere, do you always go the same speed?

ACCELERATION • The rate of change of an objects velocity • (how fast an

ACCELERATION • The rate of change of an objects velocity • (how fast an object speeds up or slows down) • Units: m/s 2 – (meters per second) – (Speed per second)

Brain Pop • Acceleration

Brain Pop • Acceleration

Acceleration = Change in Velocity / Change in Time V A=T

Acceleration = Change in Velocity / Change in Time V A=T

If a racecar is at rest (not moving) and 5 seconds later it is

If a racecar is at rest (not moving) and 5 seconds later it is moving at 20 m/s, what is its acceleration? • • • A = V/T A = (20 m/s - 0 m/s)/5 sec A = (20 m/s) / 5 sec A = 4 m/s/s A = 4 m/s 2

Cars’ Acceleration • http: //www. youtube. com/watch? v=4 j. OQFMl pd. VI

Cars’ Acceleration • http: //www. youtube. com/watch? v=4 j. OQFMl pd. VI

Accelerations can be positive or negative • Positive acceleration: speeding up • Negative acceleration:

Accelerations can be positive or negative • Positive acceleration: speeding up • Negative acceleration: slowing down

Channing Tatum is out on a bike ride. He is going at a speed

Channing Tatum is out on a bike ride. He is going at a speed of 10 m/s when he sees deer frolicking in a nearby field. He coasts for 3 seconds, down to a speed of 4 m/s to look at the deer. • What is Channing Tatum’s acceleration (deceleration)? • A = (vf-vi) / time • A = (4 m/s – 10 m/s) / 3 s • A = (-6 m/s) / 3 s • A = -2 m/s 2

Pipeline • Everyone take an 11 x 17 paper and fold it “hot dog”

Pipeline • Everyone take an 11 x 17 paper and fold it “hot dog” • You will be divided into two groups • Each group will have a starting point and ending “bucket” • The goal is to get the ping pong ball from the starting point to the bucket without it hitting the ground

Pipeline • Rules – The ball cannot hit the ground (must start over) –

Pipeline • Rules – The ball cannot hit the ground (must start over) – The ball must always have a positive velocity – Each person’s paper must be part of the paperline. – You may not touch anybody else’s paper

Pipeline Reflection • Write a 4 -6 sentence paragraph: – What was difficult about

Pipeline Reflection • Write a 4 -6 sentence paragraph: – What was difficult about the activity? – What changed between the ping pong ball and the golf ball and the marble? – Why was it easier/more difficult using the different balls? – Did you like the activity?