Speed What is speed The rate distance is

Speed

What is speed? The rate distance is covered. Speed = distance/time

Instantaneous Speed The speed of an object at an instant – Looking at the speedometer in a car – Speed taken by a radar gun – Speed reported by baseball pitches

Average Speed The total distance covered in a time interval – Speed at which someone drove from Grand Rapids to Detroit – The speed the bus completed the route – The speed Ms. Rose walked to the store.

Practice Problems 1. A car traveled 60 miles in 2 hours. 1. What was the car’s speed? 2. Is this an instantaneous or average speed?

Answer Speed = = = distance / time 60 miles/ 2 hours 30 miles/ hours – Average speed because the distance is covered over two hours.

Practice Problems 2. Mrs. Short drove from Pittsburgh to Grand Rapids (415 miles) to visit family. She left at noon and arrived at 6: 00 pm. a. What was her average speed?

Answer: Speed = distance / time = 415 miles / 6 hours =69. 2 miles/ hour

Distance Covered Distance = average speed x time

Practice Problem Captain Hook sailed for 2 hours at 20 miles per hour. a. How many miles did he travel? b. How far would he go in 10 hours?

Answer A. Distance = speed x time – Distance =20 miles/hour x 2 hours – Distance = 40 miles B. Distance = speed x time – Distance = 20 mph x 10 hours – Distance = 200 miles

Speed is relative All motion is described compared to some other object.