Forms of energy.

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Presentation transcript:

Forms of energy

The ability to do work What is Energy? Energy is transferred by a force moving an object through a distance.

What Unit is Energy Measured in? joules J Remember that work was also measured in joules. 1J = 1kg*m2/s2

2 General Types of Energy Kinetic energy Potential energy

Energy of motion Kinetic Energy Depends on the mass and speed of the moving object

KE = ½ m v2 Mass in kilograms Speed in m/s Kinetic energy in J

KE Practice A 70.0 kg man is walking at a speed of 2.0 m/s. What is his kinetic energy? KE = ½ m v2

KE Practice A 70.0 kg man is walking at a speed of 2.0 m/s. What is his kinetic energy? KE=½ m v2 KE=1/2 (70.0)(2.0) 2 First square the speed. Then multiply. ½*70.0*4.0=140J Remember!!!The unit is part of the answer!

KE Practice A 50.0 kg cheetah has a kinetic energy of 18,000J. How fast is the cheetah running? KE = ½ m v2

KE Practice A 50.0 kg cheetah has a kinetic energy of 18,000J. How fast is the cheetah running? KE=½ m v2 You are solving for v this time. √(2KE/m) = v First multiply 2 * 18,000. Then divide that number by 50.0. Last, take the square root of that number.

KE Practice √(2KE/m) = v First multiply 2 * 18,000. Then divide that number by 50.0. Last, take the square root of that number. √ 2*18000/50.0=27 m/s

Stored energy Objects position or shape give them potential energy.

PE=mgh Potential Energy M=mass and g=gravity so mg=weight Mass in kg On Earth g=9.8m/s2 H=height Height in meters

PE Practice Suppose the diver at the top of a 10.0 meter high diving platform has a mass of 50.0 kg. Calculate her potential energy. PE=mgh

PE Practice Suppose the diver at the top of a 10.0 meter high diving platform has a mass of 50.0 kg. Calculate her potential energy. PE=mgh PE=50.0*9.8*10.0 G is 9.8 because we assume she is on Earth. Simply multiply through. PE=4900J

PE Practice A skydiver with a mass of 68kg is about to jump from an airplane. His potential energy is 3046781 J. What height is he jumping from? PE=mgh

PE Practice PE=mgh Solve for h. PE/mg=h 3046781/68*9.8 A skydiver with a mass of 68kg is about to jump from an airplane. His potential energy is 3046781 J. What height is he jumping from? PE=mgh Solve for h. PE/mg=h 3046781/68*9.8 Multiply the bottom numbers first. Then divide. H=4572 m