# Shared Flashcard Set

## Details

Gravity, Mass, and Weight Study Guide
Gravity, Mass, and Weight
39
Science
12/17/2014

Term
 Gravity refers to a ________________ that attracts objects to each other.
Definition
 force
Term
 ___________ holds "us" to the Earth's surface.
Definition
 gravity
Term
 True or False Gravity is invisible.
Definition
 true
Term
 _____________ is related to the amount of matter in an _____________.
Definition
 mass / object
Term
 True or False Your mass changes as you travel to other planets.
Definition
 false
Term
 The amount of surface gravity depends on the size and mass of the planet.  The larger the diameter of a planet, the more _______________ it has.
Definition
 mass
Term
 The force of gravity increases when one object has a much larger ______________ than the other objects.
Definition
 mass
Term
 Weight is the measure of the force of _____________ on an object.
Definition
 gravity
Term
 Your weight ___________ in outer space and on other planets because their gravity is different than Earth's.
Definition
 changes
Term
 True or False Your weight changes as you travel in space.
Definition
 true
Term
 In space without gravity pulling down on them, Astronauts are essentially __________________. Though they do not weigh anything, astronauts' body shape and size does not _______________.
Definition
 weightless / change
Term
 Newton determined that gravity affects apples falling from trees and holds _____________ and ___________ in their orbits.
Definition
 planets / moons
Term
 The Law of Inertia says that a ______________ in motion tends to travel in a straight line unless it is disturbed by an unbalanced force.
Definition
 body
Term
 The Sun's gravity holds all the _____________ in orbit around it, and each _____________ gravity captures and holds its _______________ in orbit.
Definition
 planets / planets' / moon(s)
Term
 _______________ with a lot of mass can probably hold more moons in their orbit.
Definition
 planets
Term
 Asteroids
Definition
 metallic, rocky objects in space
Term
 comets
Definition
 mass of frozen gas, comic dust and ice crystals
Term
 meteoroid
Definition
 pjeices of rock and metal dislodged from comets, planets, asteroids, or moons
Term
 meteor
Definition
 meteoroid entering a planet's atmoshpere creating a bright streak of light
Term
 meteorite
Definition
 meteor that did not burn up completely and lands on the surface of a planet, moon, or asteroid
Term
 tides
Definition
 the regular rise and fall of the sea
Term
 Gravitational attraction between ____________ and Earth cause the tides.
Definition
 moon
Term
 There are _____ high tides and _______ low tides a day.
Definition
 two / two
Term
 The __________ gravity also affects the sea.
Definition
 sun's
Term
 Because the sun is farther (even though it is much bigger), it has ____________ of an effect on tides.
Definition
 less
Term
 trace fossils
Definition
 show the activities on animals
Term
 mold
Definition
 forms when hard parts of an organism are buried in sediment, such as sand, silt, or clay
Term
 fossil
Definition
 the preseved remains of a once-living organism
Term
 petrified fossils
Definition
 organisms turn into stone to preserve their remains
Term
 preserved remains
Definition
 preserved organisms in tar, ice or amber
Term
 cast
Definition
 forms as the result of a mold
Term
 How does amber preserve fossils?
Definition
 an organism gets trapped in sap and hardens
Term
 How does tar preserve fossils?
Definition
 an organism gets stuck and dies in tar - tar soaks into the organism and hardens
Term
 How does ice preserve fossils?
Definition
 an organism freezes in its original state
Term
 What do fossils tell us and scientists?
Definition
 clues about organisms that lived long ago Earth's surface changes Evolution past environments
Term
 The first step for fossils:
Definition
 An animal is buried by sediment, such as volcanic ash or silt, shortly after it dies. Its bones are protected from rotting by the layer of sediment.
Term
 The second step for fossils.
Definition
 More sediment layers accumulate above the animal's remains, and meineral, such as silica (a compound of silicon and oxygen), slowly replase the calcium phosphate in the bones.
Term
 The third step in fossils
Definition
 movement of tectonic plates, or giant rock slabs that make up Earth's surface, lifts up the sediments and pushes the fossil closer to the surface.
Term
 The fourth step in fossils
Definition
 Erosion from rain, river, and wind wears awy the remaining rock layers.  Eventually, erosion or people digging for fossils will expose the presrved remains.
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