Speed Distance Time DISTANCE Big Tam drove from
Speed, Distance, Time DISTANCE Big Tam drove from Glenrothes to London at a steady speed of 60 km/h. After 1 hour, he had driven 60 km After 2 hours, he had driven 120 km After 3 hours, he had driven 180 km After 5 hours, he had driven 300 km Distance. D == Rule? Speed S x Time
EXAMPLE 1 Billy runs at a steady speed of 4 metres per second for 55 seconds. How far has he travelled? D = S x T D = 4 x 55 D = 220 m
EXAMPLE 2 A boat travels at a steady speed of 12 km/h for 8 hours How far has it travelled? D = S x T D = 12 x 8 D = 96 km
EXAMPLE 3 A cyclist cycles for 3½ hours at an average speed of 40 miles per hour How far has she travelled? D = S x T D = 40 x 3. 5 D = 140 miles
AVERAGE SPEED He Finally, Jimthen drove he travels drives from on Glasgow toto. Edinburgh. It Aberdeen. to Inverness, The takes 100 a 4 distance hours mile to of travel 180 journey miles. a distance takes It took 2 of hours. him 180 miles. 3 hours. His AVERAGE SPEED for the journey is 60 mph His AVERAGE SPEED for the journey is 50 mph His AVERAGE SPEED for the journey is 45 mph D Speed = S = RULE? Time T Distance
EXAMPLE 1 Billy runs the 400 metres at his school sports day in 80 seconds. What was his average speed for the race? D S = T 400 S = 80 S = 5 m/s
EXAMPLE 2 Billy cartwheels from Glasgow to Edinburgh – a distance of 48 miles- in 12 hours. Calculate his average speed ? D S = T 48 S = 12 S = 4 mph
EXAMPLE 3 Superbilly flies from Earth to the planet of Wengaria. It takes him 20 hours, and is 14000 miles away. Find his average speed. D S = T 14000 S = 20 S = 700 mph 0 0 0 14 h t < r a E W en g ia r a SB
TIME His Jim Last He brother has was year, been chased Billy hea had naughty had forbeen 150 boy, chased miles, chased andand for is forbeing 240 his 140 milesaverage at atchased an an average speed by the was speed police. 50 mph. . of of 70 mph. 60 mph The chase lasted for 3 hours This chase lasted for 4 hours This chase lasted for 2 hours D Time = RULE? T =Speed S Distance
EXAMPLE 1 Billy runs the 800 metres at his school sports day in an average speed of 4 m/s. How long did it take him? D T= S 800 T = 4 T = 200 seconds
EXAMPLE 2 Billy parachutes from a height of 24000 feet. He falls at a speed of 3000 feet per minute. How long does it take him to reach the ground? D T= S 24000 T = 3000 T = 8 minutes
EXAMPLE 3 No Super. Billy is flying. Grrrrrr to problem, save a lady falling from you a building. Thank ma’am. and rrrrrrr It’sthe building My He is flying at 450 mph, is hero! 1800 miles Super. Billy away. How long will it take what rrrrr!!! I dohim to reach the lady? D T= S 1800 T = 450 T = 4 hours SB
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