Skill Builder A pendulum swings seven times per minute if the string Were half as long the pendulum world swing ten times per minute if the original lenght Were twice as long the pendulum would swing five times per minute Answer Among more shorter the rope More times it is going to swing per minute Bar graph ----- ----- ----- ----- = 5 swings per minute ----------- ---------- =7 swings per minute --------------------------- =10 swings per minute
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THINKING CRITICALLY
16. much discussion has focused on the need to drive more efficient cars and use less electricity. If the law of conservation of energy is true. why are people concerned about energy usage? people using the energy for all thing that are not important 17. if heat flows in only one direction, how can both hot and cold liquids reach room temperature as they sit on a table? the heat from the hot object goes in the air and the air goes to the cold liquid 18. think about what happens to jack and jill in the nursery room. what kinds of enrgy are used? how was each energy form used? if they are walking they are using kinetic energy but if they are sit down they are using potential energy 19. compare the 3 temperature scales you learned about. how are they different? how are they similar? the Celsius scale is based on 0°. many physical and scientific formulas can be expressed on the kelvin scale Fahrenheit scale, water freezes at 32° and it boils at 212 ° similar: they are all based off the f
SOLIDS
1.Kinetic Energy Kinetic energy is the energy associated with bodies that are in motion, depends on the mass and speed of the body. Ex: The wind when moving the blades of a mill. The kinetic energy, Ec, is measured in joules (J), mass, m is measured in kilograms (kg) and velocity, v, in meters / second (m / s). 2.Potential Energy Potential Energy is the ability of a body to perform a job according to the configuration that holds in the system of bodies that exert forces between them, that is, potential energy is the energy that is able to generate a job as a consequence of the position of a body. 3.Thermal Energy Thermal energy (also caloric energy or heat energy) is the manifestation of energy in the form of heat. In all materials the atoms that form their molecules are in continuous movement, either moving or vibrating. 4.Atoms An atom is the smallest constituent of matter that has the properties of a chemical element. Each solid, liquid, gas, and plasma is composed of
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