Conservation Laws The Law of Conservation of Blocks.

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Presentation transcript:

Conservation Laws The Law of Conservation of Blocks

Momentum Momentum is conserved

Rockets Conserve Momentum

Angular Momentum Also conserved…

Kepler’s Second Law

Energy What is Energy?

Types of Energy Potential GravitationalGravitational ChemicalChemical Springs/Rubber BandsSprings/Rubber Bands Kinetic MotionMotion HeatHeat Radiative LightLight

Kinetic Energy K = ½ mv 2

Thermal Energy Heat: The total kinetic energy of a collection of particles Temperature: The average kinetic energy of a collection of particles

Potential (stored) Energy

ABCD A pot of water is heated for a long time in an oven. Why will you burn your hand by sticking it into the water but not when you stick it into the oven? A. The water has a higher temperature than the oven. B. The molecules in the oven are moving slower than those in the water. C. The water has more heat than the oven. D. The oven has a higher temperature than the water.

Energy … Conserved K 1 + P 1 = K 2 + P 2

ABCD A rock held above your head has potential energy. When it is released, the potential energy converts to kinetic energy. Where does the energy go when it hits the ground? A. It slightly changes the Earth’s orbit around the Sun B. The rock stores it for later use. C. The rock and the ground are heated slightly D. It is transformed into gravitational potential energy.

Mass Energy E = mc 2 Principle behind Nuclear Fission (Nuclear reactors) Nuclear Fission (Nuclear reactors) Nuclear Fusion (The Sun) Nuclear Fusion (The Sun) It is another form of potential energy

Newton was wrong! Any new scientific theory MUST explain why the old theory appeared to work Rats! We’ve found a small discrepancy.