Lecture 2.2: Speed, Velocity, Acceleration

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Presentation transcript:

Lecture 2.2: Speed, Velocity, Acceleration

Speed How fast or slow something moves. Ex: Ms. McKinley’s Dodge Neon drives 70 mi/h down the 110 Fwy. UNIT: distance unit divided by a time unit (ex: m/s, mi/h, km/h)

Velocity (Not the same as speed!) Velocity is a VECTOR! (anything that has magnitude and direction) It includes speed AND direction An object’s velocity changes when: The speed changes The direction changes BOTH speed AND direction change. Example: Ms. McKinley’s Dodge Neon drives 70 mi/h NORTH on the freeway

Acceleration Change in VELOCITY Can happen in 3 ways: Speeding up Slowing Down Changing Direction

In Summary SPEED: change in POSITION over time VELOCITY: change in POSITION over time, including DIRECTION ACCELERATION: change in VELOCITY

Acceleration is the rate of change of ____. A velocity B speed C time 1.2 Speed, Velocity, and Acceleration Acceleration is the rate of change of ____. A velocity B speed C time D direction A B C D Lesson 2 Review

A car stopping at a red light is and example of a(n) ____. 1.2 Speed, Velocity, and Acceleration A car stopping at a red light is and example of a(n) ____. A displacement B acceleration C direction D velocity A B C D Lesson 2 Review

1.2 Speed, Velocity, and Acceleration It takes a runner 42.1 s to run a distance of 150 m. What is the runner’s average speed? A 0.28 m/s B 3.56 m/s C 1.75 m/s D 6.31 m/s A B C D Lesson 2 Review