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Gravity, normal forces and applied forces

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  • Gravity acts on…
    all objects with mass
    only heavy objects
    only objects on Earth
  • When a ball is thrown upward
    only at the top
    downward the entire time
    gravity acts…
    only when falling
  • If normal force suddenly becomes zero while standing, you would…
    fall downward
    stay still
    move upward
  • The normal force exists only when…
    objects are falling
    objects are moving
    objects are in contact
  • Which best describes force pairs on a table and book?
    Same direction
    No interaction
    Equal and opposite
  • A stronger push results in…
    greater applied force
    no normal force
    less gravity
  • A box is pushed but does not move. This means…
    applied force is zero
    gravity disappeared
    forces are balanced
  • Which is an example of an applied force?
    A book resting on a table
    Pushing a door open
    Earth pulling an object
  • If gravity suddenly disappeared..objects would…
    fall faster
    stay still on surfaces
    float away
  • A chair supports a sitting person due to…
    applied force only
    gravity only
    normal force
  • If the applied force is greater than opposing forces
    stay still
    the object will…
    accelerate in direction of force
    move backward
  • A force diagram must include…
    numbers only
    color coding only
    direction and relative size of forces
  • The size of an arrow in a force diagram represents…
    direction only
    type of object
    magnitude of force
  • A book resting on a table remains still because…
    normal force equals gravity
    no forces act on the book
    gravity is stronger than normal force
  • Which situation shows only balanced forces?
    A ball rolling down a hill
    A person pushing a moving cart
    A book lying on a table
  • A person pulling a suitcase demonstrates…
    normal force
    applied force
    gravity only
  • If gravity increases..the normal force on an object at rest will…
    decrease
    remain zero
    also increase
  • Gravity depends on…
    color of object
    mass of objects
    shape of object
  • When an object moves at constant speed..forces are…
    increasing
    balanced
    unbalanced
  • Which pair of forces act on a stationary object on a surface?
    Magnetic and electric
    Applied and friction
    Gravity and normal force
  • When you push a wall and it does not move
    the forces are…
    balanced
    absent
    unbalanced
  • Gravity is best described as a force that…
    pulls objects toward Earth
    only acts on moving objects
    pushes objects away from Earth
  • A force diagram represents forces using…
    arrows showing direction and size
    circles showing speed
    lines showing motion only
  • The direction of gravity near Earth is always…
    upward
    horizontal
    toward the center of Earth
  • Which force prevents you from sinking into the ground?
    Friction only
    Normal force
    Applied force
  • Which force is a support force?
    Applied force
    Normal force
    Gravity
  • If an object is at rest..the forces acting on it must be…
    decreasing
    increasing
    balanced
  • Which situation has unbalanced forces?
    A box accelerating forward
    A person standing still
    A book at rest
  • Which statement about applied force is correct?
    It only acts downward
    It only involves machines
    It involves push or pull by an object
  • When kicking a football..the force applied is…
    a normal force
    gravity
    an applied force
  • The normal force always acts…
    parallel to motion
    only downward
    perpendicular to the surface
  • Which is NOT an applied force?
    Pushing a cart
    Gravity pulling a ball
    Pulling a rope
  • A student pushes a desk and it speeds up. This shows…
    no normal force
    unbalanced forces
    no gravity
  • When forces are balanced, net force is...
    maximum
    negative
    zero
  • A larger arrow in a force diagram means…
    no force
    greater force
    less force
  • A heavier object experiences…
    less gravitational force
    greater gravitational force
    no gravity
  • When you stand on the ground..the normal force acts…
    upward from the ground
    horizontally
    downward into the ground
  • If two forces are equal and opposite..the object will…
    accelerate backward
    accelerate forward
    remain at rest or move at constant speed
  • A person pulls a rope. This is…
    an applied force
    gravity
    a normal force
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