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Unformatted text preview: S3 Credit 13 Feb 2012 13 Feb 2012 Created by Mr. Lafferty Maths Dept. Created by Mr. Lafferty Maths Dept. Calculating Distance Time Distance Speed Time Distance Speed www.mathsrevision.com Calculating Speed Calculating Time Converting Hour Minutes to Decimal Time vice versa Time, Distance and Speed Problems Time Distance Graphs Speed Graphs S3 Credit 13 Feb 2012 13 Feb 2012 Created by Mr. Lafferty Maths Dept. Created by Mr. Lafferty Maths Dept. Starter Questions Starter Questions www.mathsrevision.com + =  2 2 2 . G is p r o p o r t io n a l t o H a n d in d ir e c t ly t o T W r it e d o w n a n e q u a t io n c o n n e c t in g G , H a n d T . 5 ( 5 2 ) 4 2 5 6 g g g g g 1 . H ow many hour s in 3 4 days 3. W hy is 4. W r it e t hese f r act ions as decimals 3 15 4 5 ( b ) ( c ) ( d ) 4 6 0 6 0 1 (a) 2 S3 Credit 13 Feb 2012 13 Feb 2012 Created by Mr. Lafferty Maths Dept. Created by Mr. Lafferty Maths Dept. www.mathsrevision.com Learning Intention Learning Intention Success Criteria Success Criteria 1. 1. Know the speed formula. Know the speed formula. 1. To explain how to work out simple speed calculations using the speed formula. Average Speed Average Speed Working Out Average Speed 2. 2. Use the formula to work out simple Use the formula to work out simple speed calculations. speed calculations. S3 Credit www.mathsrevision.com Average Speed Average Speed 1 2 3 4 300 100 200 Time in hours D The straight line is the average speed for the journey White line is actual speeds during journey (T) Distance in miles In this chapter we will be dealing with average speed S3 Credit D T 13 Feb 2012 13 Feb 2012 Created by Mr. Lafferty Maths Dept. Created by Mr. Lafferty Maths Dept. www.mathsrevision.com Average Speed Average Speed Question : It is well known that speed is directly proportional to distance and inversely proportional to time. The connection Write down an equation connecting Speed Distance and Time kD T S D S D S 1 T S D S = S = From experiments we find that k =1 S3 Credit 13 Feb 2012 13 Feb 2012 Created by Mr. Lafferty Maths Dept. Created by Mr. Lafferty Maths Dept. Very Important Units must be consistent i.e. The units of all three variables MUST agree. www.mathsrevision.com Units MUST Agree Units MUST Agree If distance is in metres and time in seconds then speed is in metres per second If distance is in miles and time in hours then speed is in miles per hour If distance is in kilometres and time in hours then speed is in kilometres per hour If distance is in centimetres and time in seconds then speed is in centimetres per second S3 Credit...
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This note was uploaded on 02/13/2012 for the course HUM 400 taught by Professor Hum during the Spring '11 term at University of Phoenix.
 Spring '11
 hum

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