### Motion speed- and velocity

1. MOTION Level Middle Students By Subhash Jain
2. WHAT IS MOTION?  In physics, motion is a change in position of an object with respect to time and its reference point. Motion is typically described in terms of displacement, direction, velocity, acceleration, and time. • Start and end position? • Movement relative to what? • How far did it go? And in what direction did it go? B A20 m 15 m 10 m 5 m 0 20 sec 15 sec 10 sec 5 sec 0 sec
3. WHAT IS SPEED? Speed is the distance an object travels in a certain amount of time. To calculate speed, you use the following formula: Total Distance covered (d) Speed (v) = ----------------------------------- Total Time taken (t) eg. Suppose the horse ran 20 m in 20 sec. What is the speed of horse? 20 – 0 = 20 m Speed (v) = -------------------- = 1 m/sec 20 – 0 = 20 sec
4. GRAPH THE FOLLOWING DATA  00  05  10  15  20  00  05  10  15  20 Distance in meter Time in second 0 5 10 15 20 25 0 5 10 15 20 25 Distanceinmeter Time in second
5. VELOCITY Velocity is the speed of an object, but the direction is also included. It is calculated the same as speed, but you must include a direction in your answer. Example: the bass boat is moving 100 km / h toward the north. North  Indicate which of the following are velocities: a. 125 cm/sec b. 30 km/h northwest c. 350m/sec north d. 520 km/h