energy
define energy
energy is the ability to do work
a balloon popping
sound
a radio
electric -> sound -> heat
what is the principal source of energy
the sun
what type of energy is stored in food?
chemical energy
define kinetic energy
energy a body posses by virtue of its motion
a light bulb shining
light energy
an electric fan
electric -> kinetic
what energy conversion takes place in the sun
nuclear -> solar
how is glucose stored in plants?
it is stored as starch grains in plant cells
define potential energy
energy that is stored in a body due to its position or state
a battery
chemical energy
a sling shot
elastic -> kinetic
how does solar energy reach the earth?
it travel by waves
through what process do plants produce their own food
photosynthesis
name the 5 types of potential energy
elastic, chemical, nuclear, electric, gravitational
an object resting on a high shelf
gravitational
a microphone
electric -> sound
name some ways that solar energy is used
directly : solar panels, solar furnace
indirectly: fossil fuels and wind energy
how do animals store glucose?
as glycogen grains in animal cells
what are the non-mechanical forms of energy?
heat, light, sound
a spring
elastic
a television
electric -> sound, light, heat
what is an advantage of solar energy?
solar energy is free and does not pollute
what is the equation representing photosynthesis?
carbon dioxide + water -> glucose + oxygen
6CO2 + H2O -> C6H12O6 + 6O2