LIGASE Elementary School Physics Table of Contents Energy Types & Conversions Magnetism Electricity Sound Light PE & KEHeat.

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Presentation transcript:

LIGASE Elementary School Physics

Table of Contents Energy Types & Conversions Magnetism Electricity Sound Light PE & KEHeat

ENERGY Definition: the ability to cause a change.

Types of Energy Heat - the motion of molecules Mechanical - motion of objects Sound - vibration Chemical - chemical reactions Light - visible and invisible waves Electrical - electricity & magnetism

Conservation of Energy Definition: energy cannot be created nor destroyed, but can be transferred from one form to another.

Energy Transfers One form of energy can turn into another form. For example: –A ball thrown against the wall represents mechanical energy. The ball does not bounce back at the same speed, in part, because some of the mechanical energy is converted to sound and heat

Energy Transfer Activities Bring in different toys and household items that illustrate multiple energy transfers. Have students identify each energy in the toy/item. Most energy that is “wasted” in an energy transfer is converted to heat.

Energy Transfer Activities Batteries (chemical) Electricity (electrical) Motor turns (mechanical) Motor makes noise (sound) Motor gets warm (heat) Wheels turn (mechanical) Friction on the floor (heat)

Energy Transfer Activities Jack-in-the-Box Now you identify the energy transfers.

Energy Transfer Activities Wind-up Mouse Identify the energy transfers.

Energy Transfer Activities Wind-up Mouse Identify the energy transfers.

Energy Transfer Activities Wind-up Mouse Identify the energy transfers.

Energy Transfer Activities Have students make “Rube Goldberg” drawings illustrating multiple energy transfers. Each drawing should include a number of tasks leading up to a final goal (ex. making toast).

Energy Transfer Activities

Potential Energy The energy stored in an object.

Gravitational Potential Energy The stored energy of position. Weight (N) = mass (kg) x gravity (9.8 m/sec/sec) – 100 kg x 9.8 m/sec 2 = 980 N GPE = weight x height – 980 N x 10 m = 9, m 100 kg

Kinetic Energy The energy of motion. KE = (m x v 2 ) / 2 – (100 x 5 2 ) / 2 = 1, kg Average Velocity 5 m/sec

Pendulum Potential Kinetic

Pendulum Potential Kinetic

Pendulum Potential Kinetic

Pendulum Potential Kinetic

Pendulum Potential Kinetic

Pendulum Potential Kinetic

Pendulum Potential Kinetic

100% PE 100% KE 50% PE 50% KE

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