1
a change in an object's position compared to a fixed object (p.590)
motion
a description if a moving object's speed and direction (p.593)
velocity
a force that opposes the motion of an object (p.596)
friction
when molecules in the fluid bump into a moving object and slow it down (p.597)
drag force
an object's location compared to other objects (p.590)
position
a change in the velocity of an object (change in speed or direction)
(p.593)
acceleration
the force between the surfaces of 2 solid objects which keeps the objects from moving (p.597)
static friction
when net forces are equal in strength and opposite direction (p.598)
balanced forces
the length between 2 places (p.590)
distance
any push or pull on an object (p.594)
force
the force that opposes the sliding of an object over a surface (p.597)
sliding friction
when forces of unequal strength or forces that are NOT in opposite forces (p.598)
unbalanced forces
when things appear to be moving but they are not actually changing position (p.591)
apparent motion
give an example of continuous force (p.594)
gravity, thrust, lift
what opposes the motion of a wheel turning along a surface (p.597)
rolling friction
an object at rest tends to stay at rest (p.600)
inertia
how fast an object's position changes with time (p.592)
speed
give an example of momentary force (p.595)
hitting a baseball with a bat, squeezing clay with your hands, pulling on a rubber band
the instrument used to measure the amount of force applied on an object (p.596)
spring scale
why do people need seat belts when riding in a car? (p.600)
to protect themselves due to inertia