What factors affect the kinetic energy of a moving object?

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Presentation transcript:

What factors affect the kinetic energy of a moving object?

Kinetic energy is the energy an object has because it is moving. What is kinetic energy? The word ‘kinetic’ comes from the Greek word ‘kinesis’, meaning motion. All moving things have kinetic energy, but the amount of energy they have is not just dependent on how fast they are moving. Mawada on Thursday morning Mawada’s crazy cat

How is kinetic energy calculated? The kinetic energy (KE) of an object can be calculated using this equation: Velocity is measured in metres per second (m/s). Mass is measured in kilograms (kg). KE is measured in joules (j). KE = ½ x mass x velocity 2 = ½mv 2

kinetic energy = ½ x mass x velocity 2 A car with a mass of 1,500 kg travels at a velocity of 20 m/s. Calculating kinetic energy group question What is the kinetic energy of the car? = 300,000 J = 300 kJ = ½ x 1,500kg x 20 m/s 2

Sometimes it is necessary to rearrange the kinetic energy equation in order to calculate the mass or the velocity of a moving object. KE = ½mv 2 What are the rearranged versions of this equation for calculating mass and velocity? m = 2KE v 2 v =  2KE m Rearranging the KE equation

A lorry has a mass of 20,000 kg. If its kinetic energy is 2.25 mJ, at what velocity is it travelling? Calculating velocity group question KE = ½ x mass x velocity 2 = 15 m/s velocity =  2KE mass =  2 x 2,250,000J 20,000kg

The kinetic energy of cars

Use the KE = ½mv 2 equation to fill in the kinetic energy values in the table below for two cars each travelling at two different velocities. What factor – mass or velocity – has the greatest effect on the kinetic energy of a moving object? Dangerous speeding? KE = kJKE = kJ 1,000 kg2,000 kg 20 km/h 40 km/h KE = kJKE = kJ

Doubling the mass of a moving object doubles its kinetic energy, but doubling the velocity quadruples its kinetic energy. If the velocity of a car is slightly above the speed limit, its kinetic energy is much greater than it would be at the speed limit. This means that: Too much kinetic energy It is more difficult to stop the car and there is more chance of an accident. If the car does collide with something, more energy will be transferred, causing more damage.

Tasks for the rest of the lesson Carry out the practical on the back of your worksheet Try the GPE and KE practice questions How cool is this!!