Question | Answer |
What is a wheel with a line around it, a line could be a rope, cord, or chain. It changes the direction of force. | Pulley |
A bar that pivots on a fixed point | lever |
The use of force to move an object over a distance | work |
a machine with few or no moving parts to which you apply just one force | simple machine |
the gravitational force on an object | weight |
force that resists the motion of objects, relative to each other, when the objects are touching | friction |
force that pulls things toward earth | gravity |
a force that acts between all masses and causes them to attract one another | gravitation |
property of matter that keeps it moving in a straight line.
keeps unmoving matter at rest
move force is needed to accelerate a large mass then to accelerate a small mass | inertia |
process by which a liquid changes into a gas.
heat changes water from a liquid to a gas. | evaporation |
process by which a gas changes to a liquid.
when water vapor cools down | condensation |
puffy
indicates fair weather
rain can develop as it grows | cumulus clouds |
form low in the atmosphere.
cover the sky.
moderate (not heavy) rainfall or snowfall. | stratus clouds |
form high in the atmosphere.
made mostly of ice crystals. | cirrus clouds |
water that falls to the atmosphere.
light drizzle-stratus.
rain and other forms of precipitation fall from cumulonimbus clouds. | precipitation |
study of weather.
forecasts predications about future weather.
tools-thermometer (air temp), barometer (air pressure)anemometer (wind speed), hygrometer (humidity) | meteorology |
a large body of air that has the same temp and humidity throughout.
four types in US- continental polar(cool, dry weather) continental tropical (hot dry weather) maritime poplar (cold, humid) maritime tropical( warm, humid) | air mass |
border where 2 air masses meet.
cold front forms where a cold air mass moves under a warm air mass.
heavy rain, thunderstorms, or snow.
moves quickly | front |
form where an warm air mass moves over a cold air mass.
stratus clouds are formed.
can produce rain or snow that can last for hours. | warm front |
back and forth movement | vibration |
loudness of a sound | volume |
volume of a sound is measured in | decibels |
materials that allows SOME light to pass through | translucent |
allows MOST of the light that hits it to pass through | transparent |
DON'T ALLOW any light to pass through | opaque |
a living thing that feeds on wastes and the other remains of died plants and animals.
breaks down wastes into nutrients.
plants absorb nutrients from soil>
animals eat plants and gets nutrients> | decomposers |
an animal that eats ONLY plants | herbivore |
an animal that eats ONLY other animals | carnivore |
an animal that eats BOTH plants and animals | omnivore |
any living thing that can make it's own food | producers |
an animal that eats their own food | consumers |
a group made up of the same kind of individuals living in the same ecosystem | population |
all the population that live in the same place | community |
formed by all living and nonliving things in an area. can be as small as the area under a rock.
can be as large as a forest. | ecosystem |
all the living and nonliving things that surround you.
living-people, animals, plants.
nonliving-water, air, soil, and weather. | environment |
a post with threads wrapped around it.
threads are inclined plane that curls around a post. | screw |
two inclined planes placed back to back.
change the direction of a force.
used to cut and splint things.
used to lift and push things. | wedge |
how high or low sound is | pitch |
number of vibrations per second.
sound with a high frequency has a high pitch. | frequency |