Kinetic energy.

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What is energy? Kinetic Energy.

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Presentation transcript:

Kinetic energy

Learning objectives Describe the factors that affect kinetic energy Perform calculations involving kinetic energy

What is the difference? Dropping a piece of paper on your head Dropping a car on your head

What is the difference? Driving into a car at 5km/h

Graph to show the relationship between kinetic energy and velocity Draw a graph to show the following data What do you notice about the shape of the graph Car velocity (m/s) Kinetic energy (J) 1 750 2 3000 3 6750 4 12000 5 18750 6 27000 7 36750 8 48000 9 60750 10 75000

Graph to show the relationship between mass and velocity Draw a graph to show the following data What do you notice about the shape of the graph Mass of falling animal (kg) Kinetic energy at 10m/s (J) 1g (spider) .05 45g (mouse) 2.25 500g (hedgehog) 25 2kg (cat) 100 50kg (large dog) 2500 150kg (panda) 7500 800kg (horse) 40^000

Factors affecting kinetic energy Which 2 variables affect kinetic energy? Which has the most effect What could the formula be?

Factors affecting kinetic energy Both mass and velocity affect kinetic energy Velocity has the most effect – as you double the velocity, you quadruple the energy The formula is KE = ½mv2

Practical You will run 5m. This will be timed This will tell us the average velocity We can then work out how much KE you had if you know your mass My mass My time for 5 metres Average velocity (5 / time) Kinetic energy

Questions An 1900kg elephant falls off a building at 8m/s. Calculate the KE How fast would a 60g mouse have to travel to have the same KE? m/s and km/h Calculate the KE of an 11g bullet travelling at 230m/s Calculate the KE of a bob sled and rider (82kg) travelling at 118km/h

Questions An 1900kg elephant falls off a building at 8m/s. Calculate the KE .5 x 1900 x 82 = 60.8kJ How fast would a 60g mouse have to travel to have the same KE? 60800 = ½mv2 v=√60800/½0.06 v=1424m/s (5100km/h) Calculate the KE of an 11g bullet travelling at 230m/s ½ x 0.011 x 2302 = 290.95J Calculate the KE of a bob sled and rider (82kg) travelling at 118km/h 118km/h = 118000m/h = 118000/3600 = 32.77m/s KE= ½ x 82 x 32.772 = 44.029kJ

Learning objectives Describe the factors that affect kinetic energy Perform calculations involving kinetic energy