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