68 terms

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Terms in this set (...)

force
push, pull on object
doesn't always change velocity
balanced forces
equal in size
in opposite directions
net force
all forces
always changes velocity
inertia
tendency of object to resist motion change
bigger the mass
more inertia
Newton's 1st Law (Law of Inertia)
object with constant velocity keeps moving like that unless net force comes
Newton's 2nd Law
net force on object causes object to accelerate in force's direction
force equation
mass x acceleration (newtons)
determine acceleration
force size
object mass
friction
2 surfaces rubbing against each other
opposite motion direction
friction effects
holds back object from sliding
slows down, stops object
makes heat
determine friction
surface type
force pressing surfaces together
static friction
resting on surface
walking- shoes, ground
sliding friction
sliding over surface
weaker than static
writing- pencil, paper
rolling friction
rolling over surface
much weaker than static, sliding
bike- wheels, ground
fluid friction
moving through fluid
skydiving- air, parachute
faster or bigger the moving object
more fluid friction
fluid
substance that flows, fills container's shape
liquid, gas
increase friction
rough surfaces
surfaces push each other hard
reduce friction
smooth surfaces
surfaces push each other lightly
reduce contact b/w forces
reference point
location, object
used to see if object's moving
motion
change in object's position when compared to reference point
how car moves toward point
relative motion
when object is moving when compared to reference point
frame of reference
view where object's motion is watched
veer
direction change
bearings
help (rotating) parts (wheels) move freely
axles
round, rotating rods
connect wheels
wheel attached to each end
chassis
frame, wheel system
support engine, load
gravity
attraction b/w all pairs of objects
downward pull
car's Fp
speed
how fast, slow distance changes
measured by #x wheels rotate
instantaneous speed
object's motion rate at given instant
air resistance
air puts on moving object
opposite motion direction
determine air resistance amount
object's
speed
size
shape
SA
density
bigger the object's surface area
more air resistance
terminal velocity
highest velocity reached by falling object
all objects' weight directed down
Fg (all objects)
between 2 touching solids
prevents them from being in same place
Fn (solids)
opposite direction of motion
Ff (solids)
being pulled from opposite ends
Ft (solids, liquids, gases)
applied by person or object
Fa (solids, liquids)
objects traveling through air
air resistance (solids)
moves forward
Fp
Fg (abbreviation)
gravity
Ff (abbreviation)
friction
Fn (abbreviation)
normal
Fp (abbreviation)
propulsion
Fnet (abbreviation)
net
Fa (abbreviation)
applied
Fs (abbreviation)
spring
Ft (abbreviation)
tension
criteria
goals that must be completed to achieve challenge
constraint
factors that limit how problem is solved
coast
to move without continuous force
qualitative data
info describing object qualities seen, not measured
quantitative data
info based on measurements, counting
baseline
value(s) that can be basis for comparison
iteration
repetition that tries to improve process, product
average speed
overall speed rate
centerline
imaginary line down middle
used as reference point
performance testing
(formal) process of testing, measuring
quality is key
1 change at a time
negative acceleration (deceleration)
decrease in speed/time
independent variable
varied, manipulative
dependent variable
outcome factor
may change due to independent variable changes
constant (variable)
doesn't change
lubrication
substance put b/w 2 surfaces
reduces friction
(oil, grease)
magnitude
size, extent
newton
force unit measure
how do unbalanced forces change motion?
speed up (start moving)
slow down (stop moving)
change direction