What does the word “acceleration” mean to you? DO NOW QUESTION What does the word “acceleration” mean to you? Objective: SWBAT calculate acceleration.

Acceleration Notes (2.1) 9/17/14 Objective: Students will be able to (SWBAT) calculate acceleration.

Position, Velocity, and Acceleration Position is a variable that we can measure and change.

Position and displacement We call the “starting point” the “origin.” A change in position is called displacement.

Position and displacement A displacement of – 20 cm means the car moves 20 cm TOWARD the origin. A displacement of + 20 cm means the car moves 20 cm AWAY FROM the origin.

Velocity means an object’s speed and its direction of motion. Constant velocity means that the speed and the direction an object is traveling remains the same (or constant.)

Displacement is the change in position. Velocity Displacement is the change in position.

Acceleration is the rate at which velocity changes. Three ways to accelerate: speeding up slowing down changing direction

Question?????????????? A car is turning at the same speed. Is this an example of constant velocity or acceleration?

Calculating acceleration

Units of acceleration An acceleration in “meters per second per second (m/s/s) is often written m/s2 or meters per second squared.

Calculating acceleration A sailboat moves at 1 m/s. Wind increases its velocity to 4 m/s in 3 seconds. Calculate the acceleration. A toy car rolls on the floor at 2 m/s. Friction slows it down to 1 m/s in 5 seconds. Calculate the acceleration. 1 m/s2 -0.2 m/s2

Investigation 2.3: Position, Velocity, and Time Graphs 9/19 – 9/22 Investigation 2.3: Position, Velocity, and Time Graphs Key Question: What happens to the velocity of an object as it moves downhill? Objectives: Explain the motion of the Energy Car, in terms of velocity and acceleration, as it moves along an inclined track. Infer the meaning of acceleration from a velocity versus time graph. Apply the acceleration formula to solve problems.