2 Let’s ReviewDistance traveled (m)Average Velocity(m/sec)v = dtTime taken (sec)Instantaneous Velocity: the speed at any given moment (like what your speedometer shows)
3 Slope of Position vs Time graph is the Average Velocity The slope of a line is the ratio of the “rise” (vertical change) to the “run”(horizontal change) of the line.
4 Constant SpeedOn a Velocity vs Time graph constant velocity is a straight line
5 Area under the velocity vs time graph is equal to the distance travelled.
6 What is a Motion Diagram? Motion Diagram: Is a more sophisticated dot diagram that conveys more information about the situation.What do the arrows indicate?What does the length of each arrow indicate about the motion of the object?
7 Change in VelocityWhat must you do to the first velocity arrow to get the second velocity arrow? What direction? How much?The arrow you drew to show the difference between the velocity arrows is called a ∆v or change in velocity arrow.What does the ∆v arrow tell you about the motion of the object?
10 Motion of a Falling Object Using the video of the falling object we have collected the following data:Draw a motion diagram.Plot a position time graph.Does this object represent an object with constant velocity? Explain how you know.
11 What is Acceleration?Acceleration is a vector quantity that is defined as the rate at which an object changes its velocityThere are 3 types of acceleration:If an object is increasing in speed (+ acceleration)If an object is decreasing in speed (- acceleration, also called deceleration)Or if the object changes direction (+ or -)
12 How do we calculate Acceleration? Acceleration is the change in speed over the change in time.The slope of the speed versus time graph is the acceleration.
28 Action/Sign of Velocity Decreasing speed + direction Determining signs for velocity and accelerationDirection of MotionAction/Sign of VelocitySign of AccelerationIncreasing speed+ direction+Decreasing speed + direction-Increasing speed- direction-+Decreasing speed- direction