Constant Velocity Lab grading rubric How Far position

Constant Velocity

Lab grading rubric

How Far? • position: The location of an object • symbol: x • distance: How far an object has traveled – symbol: d – units: meters • displacement: – symbol: – units: meters How far an object is from it’s initial position Is a “vector” quantity A vector quantity has magnitude AND direction A plain, old quantity is called a SCALAR

Our first Equations!!! • Displacement is the difference between an object’s initial position and where it winds up. – We’ll call initial position: – So we’ll call final position: – Therefore,

Motion Intro Speed. The rate of distance traveled over time symbol: v units: Velocity- the rate of displacement done over time the rate of change in position over time symbol: units:

Motion Graphs At the end of the stomper lab there were two graphs • The blue graph, of the stomper car going forward, has a positive slope • The red graph, of the car going backward, has a negative slope • Slope has the same value, just opposite sign So, is the slope of a position vs. time graph speed, or velocity?

Motion Maps • You made one in the Stomper Car Lab: – It shows the position of an object in motion at equal time intervals v 1 v 2 v 3 v 4 v 5 0 sec 1 sec 2 sec 3 sec 4 sec 5 sec 1. Label your position marks, starting with 0 s (we’ll assume time in seconds) 2. Draw an arrow (velocity vector) from one position to the next 3. Label that 1 st vector as v 1 4. Repeat for following velocities

Handy Advice 1. Take our velocity equation 2. Substitute in for displacement 3. Solve for “xf”