Forces Flashcards
Force
something with the capability to cause a change in motion of a system
push/pull
properties of a force
magnitude
point of application
direction
direction
way the force is applied
magnitude
size of the applied force
point of application
point at which the system receives the applied force
line of action
imaginary line extending indefinitely along the vector through the tip and tail
types of forces
contact/non-contact
action/reaction
external/internal
motive/resistive
contact force
the result of physical contact between 2 bodies
non-contact forces
newton’s lay of universal gravitation explains the interaction of objects even when they are not in contact
attraction force between bodies of mass
action forces
initially applied force
reaction forces
the simultaneous equal counterforce acting in the opposite direction to the action force
external forces
interact with the system from the outside
only external forces can change the motion of the system
internal forces
act within the defined system
only internal forces can change the shape of the system
motive force
a force that tends to lead to a change in motion in the form of increased velocity or change in direction of the system
resistive forces
tends to prevent changes in motion by other external forces or decrease the velocity of a system that is already in motion
gravity
pulls on an object’s mass with a certain amount of force
gravitational pull is concentrated at the center of mass
weigth
measure of the force with which gravity pulls upon an object’s mass
friction
force that resists the sliding of 2 objects in contact
exists when 2 objects are in contact and have a potential of sliding across each other
static friction
when 2 contacting surfaces are not currently sliding relative to each other but do possess the potential for movement
kinetic friction
when the 2 contacting surfaces are already sliding relative to each other
rolling friction
when one surface is rolling over another but not sliding
vector composition
situation where multiple force act upon a system and want to find the resultant force vector
complexity of vector composition depends on
number of vectors
relative directions and orientations of the vectors
vector resolution
process used to resolve a single vector into its individual directional component vectors
