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Science CBA#2 Review

pulley a simple machine, consisting of wheels, that reduces force and helps make work easier
compound matter made of two or more elements, such as H2O.
element matter that is a pure substance and made of only one kind of atom, such as Carbon (C).
physical change (also called physical reaction) occurs when one or more physical properties of a substance are changed, but the substance keeps its identity, such as water changing from a liquid to solid ice.
chemical change( also called chemical reaction) occurs when one or more substances are changed into new substances with different properties that can't be change back to the original properties, such as frying an egg
fossil fuels fuels such as coal, oil, and natural gas; formed over millions of years from the remains of ancient plants and animals
renewable resources natural resources that can be renewed or replaces by nature, such as food crops and solar energy
nonrenewable resources natural resources that cannot be replaced once used, such as oil, coal, natural gas, and minerals
solar energy energy from the sun in the form of heat and light
geothermal energy energy obtained from thermal energy inside the Earth
biomass matter formed by plants or animals that is used as a fuel, such as wood or corn oil
hydroelectric energy electricity generated using the power of falling water to turn turbines, usually associated with dams
law of conservation of energy energy cannot be created or destroyed, it can only change form or be transferred
potential energy stored energy an object has because of its position or shape
kinetic energy energy an object has because it is moving
wind energy electricity produced by using windmills
A hot nail is placed in a beaker of cold water and allowed to sit for several hours. What will happen to the temperature of both matter? They will both be the same temperature after a few hours
radiation the transfer of energy in the form of electromagnetic waves
conduction the transfer of heat from a warmer substance to a cooler substance through direct contact (touching each other)
convection the transfer of thermal energy in a fluid (liquid or gas), in which warmer fluid rises and cooler fluid sinks
speed distance traveled by an object in a given amount of time, figured by distance divided by time (s = d/t)
A train travels 1,600 miles in 40 hours. What is its average speed? 40 mi/h
A car travels 120 miles in 2 hours. What is its average speed? 60 mi/h
A flashlight changes ___________ energy into ____________ energy. electrical energy into light energy
You eat lunch and then ride your bike. You are turning ___________ energy into ___________energy chemical energy into mechanical
A television converts electrical energy into light and sound energy. The electricity that is not used for light and sound is.... turned into heat
Average speed of 400 meters in 45 seconds 16 m/s
Average speed of 425 meters in 50 seconds 8.5 m/s
Average speed of 375 meters in 55 seconds 6.8 m/s
Average speed of 390 meters in 55 seconds 7.09 m/s
Created by: bspencer61