"Kinetic Energy"
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What is Kinetic Energy?
The energy stored in moving objects
What is Kinetic Energy Formula?
0.5 x m x v^2
What is stored in a Car and what?
Chemical energy stored in petrol
How is chemical energy stored in petrol turned into Kinetic energy stores?
As the Car moves
Question : A car with a mass of 700 kg is moving with a speed of 20 m/s. Calculate the kinetic energy of the car with this formula 0.5 x m x v^2
0.5 x 700 x 20^2 = 140,000 J 140 000 / 1000 =140 kJ
A cyclist and bike have a total mass of 100 kg and a speed of 15 m/s .Calculate the kinetic energy of the car with this formula 0.5 x m x v^2
0.5 x 100 x 15^2 = 11250 J 11 250/1000 kJ = 11.25 kJ
Formula for mass
E/0.5 x v^2
A tennis ball is travelling at 50m/s and has a kinetic energy of 75 J. Calculate the kinetic energy of the car with this formula E/0.5 x v^2
75/0.5 x 50^2 = 0.06 kg