GRAVITATIONAL POTENTIAL & KINETIC ENERGY

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GRAVITATIONAL POTENTIAL & KINETIC ENERGY

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GRAVITATIONAL POTENTIAL & KINETIC ENERGY Work, Energy & Power GRAVITATIONAL POTENTIAL & KINETIC ENERGY

Work Recall: Calculated by Work is the change in energy of a system. Positive work > System ends up with more energy. Negative work > System ends up with less energy. Calculated by Where: W = Work (J) F = Force in direction of motion (N) d = distance (m)

Gravitational Potential Energy The type of energy possessed by an object because of its height above ground. To lift an object using work: M ∆h *Force to lift is force of gravity *Since doing work changes energy in system. Where: EG=Gravitational Potential Energy (J) m = mass (kg) ∆h= height (m) (starts on ground)

Example 1 Calculate the gravitational potential energy of a 15kg object 2.3m above the ground.

Kinetic Energy The type of energy due to an object’s motion. Calculated by: Units of Kinetic Energy are Joules (J). Where: EK= Kinetic Energy (J) m = mass (kg) v= velocity (m/s)

Kinetic Energy & Work Using work: *Kinematics formulae *Diff of squares

Example #2 What is the mass of a bullet traveling at 360 km/h with 750 J of kinetic energy?