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Sci-5 Chapters 6-7

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  • There are two main categories of forces — _____ forces and non-contact forces.
    contact
  • True or False: Mass can change with location.
    False, unlike weight, mass is a constant (doesn't change)
  • Air _______ is a force that slows down moving objects in the air.
    resistance
  • Some forces can be ______ between objects that are not touching each other.
    exerted
  • The process of the Earth traveling around the Sun is called ______.
    revolution
  • The ______ of a planet determines the strength of gravity on its surface.
    mass
  • The Milky Way is a ______.
    galaxy.
  • True or False: Without friction, we would not be able to walk.
    True
  • True or False: Other planets and moons release light.
    False, we see them because they reflect the light from the Sun
  • The Moon has different ______ as it orbits Earth.
    phases
  • The Earth spins on its ______, an imaginary line through its center.
    axis
  • The Earth takes about ______ days to complete one orbit around the Sun.
    365
  • True or False: The rougher a surface is, the less friction it has.
    False
  • A/An ______ is a scientist who studies space, including stars and planets.
    astronomer
  • The Earth is part of a system in space called the _________.
    Solar system
  • A ______ is an object in space that orbits around another object.
    satellite
  • Who was the astronomer that proposed that the Earth orbits around the Sun instead of the Sun orbiting around the Earth?
    Nicolaus Copernicus
  • The telescope was improved by ______, who used it to study the stars.
    Galileo Galilei
  • The Solar system includes the Sun and ________ planets.
    eight
  • Magnets have a north and south ____.
    pole
  • An ___________ is exerted when a spring is compressed or stretched.
    elastic spring force
  • Which situation shows air resistance at work?
    A plane flying in the sky
    A magnet attracting a paperclip
  • The ______ is the only natural satellite of Earth.
    Moon
  • Opposite poles _____ each other.
    attract
  • The same poles ______each other.
    repel
  • The force that keeps planets in their orbits around the Sun is called ______.
    gravity
  • A force is ...
    A movement without direction
    A type of energy
    A push or pull on an object
  • The unit of mass is ___.
    kg, lb
  • What would happen if Earth stopped rotating?
    If Earth stopped rotating, one side would always face the Sun and be very hot, while the other side would be in constant darkness and be very cold.
  • True or False: We can't feel the Earth spinning.
    True, we don’t feel it because it spins very smoothly and we move with it.
  • The Sun is our main source of ____ and ____.
    heat and light
  • We use ___ as a unit of weight.
    N, Newton, example: 82 N
  • True or False: Weight can change with location.
    True, it changes from place to place.
  • When one objects interacts with another object, it results in some _____.
    force
  • The Sun constantly releases _______.
    energy
  • ______ is a force that causes moving objects to slow down.
    friction
  • Why does the Moon shine at night if it does not produce its own light?
    The Moon shines because it reflects light from the Sun.
  • ______ and tilted ______ cause the change of seasons on Earth.
    revolution and tilted axis
  • Air resistance is a type of ______ too.
    friction
  • When two like poles of a magnet face each other, they ...
    attract
    repel
  • What is the center of the solar system?
    The Sun
  • When you stretch an elastic string and then let go, ...
    It returns to its original shape
    It stays stretched
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