physics Flashcards
if a net force is zero, will the velocity change?
it will be constant and there will be no greater force that needs to be applied
what type of force is a gravitational force?
pulling force
if accel is 0 what does that tell u about velocity?
it is either constant or zero
unbalanced force impacts direction of acceler and?
velocity direction
t or f ? unbalanced force will always change dir?
no bc it could be going on same dir as accell
when there’s a force that hits the center of mass, the forrce will cause?
the object to move in the direction of the force
what happens when force is applied on the object away from the center of mass?
object will then rotate around the center of mass bc of the force that was applied at one of the ends and not the center
when it comes to pulleys. each one has the same or different forces?
same forces
when thinking about the formula for work, what happens to cosine when the force and distance is in the same direction?
cosine will become cosine of 0 degrees or 180 which will become one
normal force means what
normal force is perpendicular to floor/surface making cos 90 deg
gravitational force is perpendic or parallel to surface
perpendicular
how do u increase and decrease the normal force of an object
to increase, you push down on the object
to decrease, you lift up the object like using a tension force which will reduce the stress
why are the weight force/ normal force and the centripetal/centrifugal not part of action reaction pairs?
they cannot be bc together they act on the same object. action reaction means one force acts on one pair of the object while the other force will act on the other object
why are the car tires for a car turning static friction and not kinetic?
it is still driving smoothly to make that turn (friction bc not going straight anymore) but not sliding off of the road which will be kinetic
type of angle btwn accel and velocity in ucm?
perpendicular
why is there change in velocity in circular motion?
constantly changing in direction around the circle
why do u set centripetal force equal to the other forces?
its not a physical force independently but the result of the other forces so it is equal to net force
define closed sys
only exchange energy like earth still getting energy from sun
isolated sys
doesn’t exchange matter or energ
open sys
free to interact with environment
heat vs temp
temp measures thermal energy
heat transfers thermal energy btwn sys and environ
center of mass
the balance point of an object (usually in the moddle)
ignores the rotation of an object
torque and why does it occur
effect of a force (not a force itself) and causes rotation and can measure how fast it rotates
cannot occur when static or without any acceleration
pivot
point that the object will start rotating around