Speed How can I work out the speed of objects? Starter: Man Vs Cheetah ? Who would win a race? DJns#

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Presentation transcript:

Speed How can I work out the speed of objects? Starter: Man Vs Cheetah ? Who would win a race? DJns#

Learning Outcomes define speed understand how to measure speed distinguish between average speed and instantaneous speed

Hussein Bolt has the world record at 100m Watch this clip – record how long it took to complete the race and how long the race was. K-8G2nwU K-8G2nwU I can run SOOOOO fast!!

So how do you work out speed? Think – what is speed?

Check point – what is the equation for speed? Speed = Time Distance Distance time 12

The Speed Formula Speed = distance time S D T Copy this up

What do we measure speed in? What units of distance do you know? What time values work with them? Speed = distance / time so … km / h m/s mile/hour

It’s a SPEED RACE ! Task – collect your first question. Take it back to your desk, answer the question. Show me your answer Grab the next Q if it is right!

Question 1 I run 100 m in 10.3 seconds. What is my speed in m/s?

Question 2 I drive 450 miles in 8 hours. What is my speed in mph? (miles per hour) I drive 450 miles in 8 hours. What is my speed in mph? (miles per hour I drive 450 miles in 8 hours. What is my speed in mph? (miles per hour)

Question 3 A snail moves 1m in 1650 seconds. What is his speed in m/s?

Question 4 I run the marathon (23 miles) in 3 hours 30 minutes. What is my speed in mph?

Question 5 A Cheetah runs 500m in 45 seconds. What is his speed and what are the units?

Average / instantaneous speed I travel from Bristol to London in my car. It took me 30 minutes to reach Swindon, another 30 minutes to read Reading and then another hour to reach my destination in London.( the traffic is BAD.) The distances are as follows. Bristol to Swindon: 40 miles Swindon to Reading: 50 miles Reading to London: 40 miles What was my average speed ? Why is it called my average speed?

The Race is on Design a race track. Measure the length. Race your vehicle. Calculate your average speed. The winner is the fastest object.

What does todays Lesson Look like? To do list Starter: order pictures in order of speed. Success criteria Have placed the cards in the correct order. Main: watch a clip of a runner and use the information to work out his speed. Power point on distance time graphs Check point – what is the equation for speed? Have found out the distance, time and therefore speed of the runner. Plenary: Draw a distance time graph for a journey described to you. Main: complete an investigation into speed. Completed the obstacle course and taken measurements. Drawn a distance time graph for the. Plenary: correctly drawn the graph for when the car is moving and stationary.