Here is Usain Bolt’s 100 m world record time. What was his average speed during this race?

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Presentation transcript:

Here is Usain Bolt’s 100 m world record time. What was his average speed during this race?

SPEED n Speed tells us how fast an object is moving. n Speed = distance time n Speed is measured in m/s or km/h

FIVE FACTS ON SPEED! n Speed tells us how many metres an object moves in one second. n Speed = distance_ time n Speed is measured in metres per second. n Speed can be measured in kilometres per hour. n Nothing can travel faster than the speed of light.

How fast can I move? n By making precise measurements and calculations calculate how fast you can do the following things n 1. Run n 2. Hop n 3. Walk n 4. Skip like a girl.

How to Answer Speed Questions! n A man walks 20 m in 10 s. What is the man’s speed? n Step 1: FORMULA n Speed = distance/ time (1 Mark) n Step 2: Working out! n Speed = 20 m / 10s (1 mark) n Step 3: Answer with units n speed = 2 m/s (1 mark) n (3 marks in total!!!!!!)

SPEED QUESTIONS n 1. A man walks 400 m in 80 seconds. Calculate his speed. n 2. A car drives 600 km in 3 hours. What was the cars average speed? n 3. A giraffe, Dave, runs 220 m in 5 seconds. Find Dave’s speed. n 4. A goat moves 2 km in 2 seconds. What was his speed and how did this happen? n 5. A sheep runs at 5 m/s. How far will it move in 11 seconds?

ARE WE THERE YET? n You are on your way to Dusseldorf in a car. You still have 240 km to drive. n How long will it take you if you drive at an average speed of 80 km/h? n How fast would you have to drive if you wanted to get there in 2 hours? n If you were stuck in a traffic Jam and could only drive at 40 km/h how much further would you have travelled in 2 hours?

HARDER SPEEDY STUFF n 1. A man moves 55 metres in 10 seconds. Calculate his speed! n 2. A car drives 250 km in 1.5 hours. Calculate it’s speed. n 3. A goat runs at 2 m/s for 12 seconds. How far does it move? n 4. A sausage moves at 20 m/s for 100m. How long does it take to cover this distance? n 5. A toady fish swims at 6 m/s for 4.5 seconds. How far did toady fish move in this time?