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diagram that shows an obj. & all forces acting on it?
free body diagram
forces are drawn as ?
length of arrows correspond to
magnitude of the force ( net force how large it is )
Forces in Free Body diagrams
normal force ( support force )
this force is the force of gravity that is shown as "FG"
in all diagrams unless you are told you can omit it
its always pointing down towards the center of the earth
support force that holds up objects due to contact with a surface
shown as fn
so long as the force is flat it cancels out all downward forces
normal force & weight
but what if it is not a flat surface?
then the object slides down.
WHEN SURFACE IS FLAT, POINTS STRAIGHT UP ( NORMAL FORCE ). IF SLANTED IT GOES AWAY FROM THE SURFACE. ON A SLANT DOESN'T CANCEL OUT IT SLIDES DOWN. IT GOES AWAY FROM THE SURFACE.
if forces cancel out what happens?
but if they dont
object slides down.
this force is opposite from the way of motion, keeps something from sliding it must be opposite from the way of motion.
friction is represented as ?
any force that keeps an object from moving, there is friction ( any force that slows you down )
this is considered as friction
PUSH OR PULL BY AN OBJECT BY ANOTHER OBJECT ( ANY DIRECTION )
APPLIED FORCE ( FA )
an applied force by a rope or string
sum of all forces
an object at rest is a __________ equilibrium
it is at rest and will remain at rest until the net force becomes a ?
an object moving at a constant velocity is a __________ equilbrium
it will remain at a constant velocity until the net force is a ?
AN OBJECT AT REST WILL REMAIN AT REST AND AN OBJECT IN MOTION WILL REMAIN AT A CONSTANT SPEED AND A STRAIGHT LINE SO LONG AS NET FORCE IS?!
0N SIGMA F
TENDENCY OF AN OBJECT TO RESIST A CHANGE IN MOTION.
the more the mass an object has the more it __________ change in motion
AMOUNT OF INERTIA AN OBJECT HAS?
mass and ______ have a directly porportional relationship
any change into one variable gives the same change to the other?
if you double the mass you double the ?
if you reduce mass by 2 you reduce _____ by 2.
difference between vector and scalar scales?
vector - has both magnitude and direction
scalar-only has magnitude
an example of a vector quantity?
force & area
an example of a scalar?
on graphs : independent variable goes on the which axis?
dependent variable goes on the which axis?
always lable the axis with ?
connect the graph with ?
graph is always __________ vs. ___________
dependent vs. independent
in a diagram explaining a girl hitting a volleyball : girl hitting ball from the left flying to the right. where are the forces?
ff <- () -> fa
why is there an FF and no FN?
there is an FF because there is friction from air resistance, there is no FN because there is no contact with a flat surface, its going through the air and not resting anywhere.
in a diagram explaining a rock being pulled by a string on a 15 degree angle, explain the forces. flat on the left, being elevated 15 degrees up from the right
explain why are the forces where they are?
FN- because there is a surface. & its pointing away from the FG because it is slanted.
FG- because weight
FT- being PULLED by a STRING ( tension )
can an object be moving and still be an equilibrium?
yes an object at a constant velocity and going in a straight path.
the magnitude of the force of friction on a crate compound with my push is that the force of friction must be what?
equal to the force of push.
Recommended textbook explanations
Physics for the IB Diploma Coursebook
K. A. Tsokos, Mark Headlee, Peter Hoeben
Fundamentals of Physics
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