ch12 Flashcards
the branch of physics that studies forces and how they can change an objects motion
Dynamics
causes a change in motion
a force
a push or pull on an object
force
a force that acts only when one object touches another
contact force
a force that acts between objects that are not touching also called a field force at a distance.
field force
reaction force
normal contact force
multiple simulatanuas forces that are unbalanced. net force vector equals sum of forces
unbalalanced forces
multiple simulatanues forces whose pushes and pulls cancels eachother out.
balanced forces
a sketch that shows an object and the forces acting on it also called a force diagram.
free body diagram
the tendancy of matter to resist changes in its motion. johanas Kepler gave the name
inertia
the law that states that objects at rest tend to stay at rest and objects in motion stay in motion unless acted upon by an unbalanced force.
the law of inertia
the law that states that the acceleration of an object is directly poprotional to the net force acting on the object and is inversely proportional to its mass.
the law of acceleration
the law that states that for every action force there is an equal and opposite reaction force
the law of action and reaction
action reaction pairs don’t relate to balanced or unbalanced forces.
action reaction principle
a pulling force that is transmited through a rope, chain or similar object.
tension
upward force that acts perpandiculat to where two objects
normal force.
three types of friction
static kinetic and rolling
what direction does friction act
the exact opposite direction of the attempted motion.
