Lecture 2 2 Speed Velocity Acceleration Speed How

Lecture 2. 2: Speed, Velocity, Acceleration

Speed How fast or slow something moves. Ex: Ms. Mc. Kinley’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. Mc. Kinley’s Dodge Neon drives 70 mi/h NORTH on the freeway

Acceleration Change in VELOCITY Can happen in 3 ways: 1. Speeding up 2. Slowing Down 3. Changing Direction

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

1. 2 Speed, Velocity, and Acceleration 1. 2. 3. 4. A B C D Acceleration is the rate of change of ____. A velocity B speed C time D direction

1. 2 Speed, Velocity, and Acceleration 1. 2. 3. 4. A B C D A car stopping at a red light is and example of a(n) ____. A displacement B acceleration C direction D velocity

1. 2 Speed, Velocity, and Acceleration 1. 2. 3. 4. A B C D 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