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28 terms

5th Science Unit 3 les 1-2

STUDY
PLAY
position
location of an object
motion
change in position of an object over time
distance measurements
meters, kilometers, feet, miles
direction measurements
compass, protarator, units of degrees
frame of reference
needed to measure position or motion
speed
the rate at which an object's position is changing over time
units of speed
meters per second
kilometers per hour
feet per second
miles per hour
velocity
the object's speed and its direction of motion
acceleration
any change in the velocity over time of an object
(change in speed or direction)
deceleration
negative acceleration
momentum
object's mass multiplied by its velocity
mass x velocity
greater inertia
the more mass an object has, the
inertia
tendency of an object to resist a change in motion
units of force
newton
pound
arrow
used to indicate the strenght and direction of a force
3 forces that act on an airplane
thrust
lift
drag
gravity
force that pulls all objects together
2 factors - determines amount of friction
roughness of the surfaces (makes sliding difficult)
how amouont of force used to push the 2 objects together
heat
created whenever there is friction
Law of inertia
an object at rest tends to stay at rest,
and an object oin constant motion tends to stay in motion,
unless acted upon by an unbalanced force.
balanced forces
effect is offset by other forces, so motion won't change;
often point in opposite directions and always add up to zero
unbalanced forces
cause an object to change its motion
object's acceleration decreases
as its mass increases if the force applied to the object remains the same
air resistance
force that slows down objects that are moving through air
force
push or pull
thrust
force that pushes an airplane forward
Newton's law of universal gravitation
the force of gravity depends on distance and mass
friction and drag
on Earth, these forces tend to slow an object down