Kinetic Energy.

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Presentation transcript:

Kinetic Energy

Kinetic Energy: Energy of moving objects. Scalar value Measured in Joules (J) Where: m = mass v = speed Ek = ½mv2

Example A 60.0 kg student is running at a uniform speed of 5.70 m/s. What is the kinetic energy of the student?

Example The kinetic energy of a 2.1 kg rotten tomato is 1.00 x 103 J. How fast is it moving?

The Work Energy Theorem If a net force acts on an object then it must be accelerating. This acceleration is proportional to its change in kinetic energy. Therefore: W = Fnetd = ∆Ek

Example A sprinter exerts a net force of 260 N over a distance of 35 m. What is his change in kinetic energy?

Example A student pushes a 25 kg crate which is initially at rest with a force of 160 N over a distance of 15 m. If there is 75 N of friction, what is the final speed of the crate?

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