Aim How can we use kinematics charts or

Aim: How can we use kinematics charts or G. U. E. S. S to help us solve motion problems? Do Now: Quiz HW: Problem Set

Rapid Fire Stations • In 3 groups you will work together to solve a kinematics problem. You have 30 seconds to solve it and then must pass it on with any work finished to the next group.

Problem 1 • An airplane cruising at 200 m/s decelerates at the rate of 7 m/s 2 for 20 seconds. Calculate the distance that the airplane travels during the 20 seconds. d = 2600 m

Problem 2 • A car traveling 88 km/hr is 110 m behind a truck traveling 75 km/hr. How long will it take the car to reach the truck? 88 km/hr – 75 km/hr = 13 km/hr = 0. 110 km/t t = 0. 0085 hr = 30. 5 sec

Problem 3 • A ball player catches a ball 3 seconds after throwing it vertically upward. With what speed did he throw it and what height did it reach? Using t = 1. 5 sec at top Vf = 0 m/s at top Vi = 15 m/s d = 11. 0 m

Tricky Speed vs. Velocity Problems Speed Velocity Scalar Vector DISTANCE/time DISPLACEMENT/time

A car travels around a corner by traveling 50 meters east, then 50 meters north. It makes the trip in 50 seconds. Calculate the car’s average SPEED Distance==? 100 m Total time = 50 s

A car travels around a corner by traveling 50 meters east, then 50 meters north. It makes the trip in 50 seconds. Calculate the car’s average VELOCITY Displacement= = 70. 7 m ? Time = 50 s

Tricky Speed and Velocity Calculate the average speed and average velocity of a complete round trip in which the out going 250 km is covered at 95 km/h, followed by a one hour lunch break and the return 250 km is covered at 55 km/h. • Total distance = 500 m • 250 m/t 1 = 95 km/hr t 1 = 2. 63 hr • 250 m/t 2 = 55 km/hr t 2 = 4. 55 hr Average speed = 500 m/(2. 63 + 4. 55 + 1)hr = 61 km/hr Average velocity = 0 km/hr

A horse canters away from its trainer in a straight line, moving 116 m away in 14 seconds. It then turns and gallops halfway back in 4. 8 seconds. Calculate its average speed and its average velocity for the entire trip, using “away from the trainer” as the positive direction. • Remember the difference between displacement and distance!