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## Bulletin Board

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**Bulletin Board**• Reading • Pages 28-39**Acceleration**Non-uniform Motion**Review**The motion of a remote control car can be represented by a graph.**Review**The motion of a remote control car can be represented by a graph.**Review**The motion of my caliber can be represented by a graph.**Review**? The motion of my caliber can be represented by a graph.**Review**The motion of my intrepid can be represented by a graph.**Uniform Motion – no change in velocity**Notice that when Motion is Uniform, the instantaneous velocity is the same as the average velocity for every interval of time.**Calculate the change - Δ**What are the units?**Calculate the change - Δ**Acceleration is a vector!**Group Questions**Shaddy is flying an airplane East across the ocean. He realizes that he started the decent too late and now must bring his speed down from 450 km/h to 300 km/h in 1 minute. Is this a greater deceleration that what you feel in a car? Caroline’s model airplane needs to achieve a velocity of 20 m/s before it can take off. It is capable of accelerating at a rate of 0.80 m/s2. What is the shortest runway that she can use to operate her plane? (two parts to this question) Hint: The area under a V-T graph is displacement.**Instantaneous Acceleration**What is the instantaneous acceleration?**Example:**While driving to work this morning, Mr. West drove from his apartment (the origin) to the school down Victoria Park. The following is a Position-Time graph of his Non-Uniform motion. Find the instantaneous acceleration for each interval of time. What is the greatest acceleration Mr. West felt?**Example:**First, we find the velocity for each point.**Example:**Next, we calculate the instantaneous acceleration.**Fun with applets:**Work on problem set in your groups.