exam 2 Flashcards
(32 cards)
define dynamics
investigation of forces acting on an object and resulting motion of object
define force
interaction that can result in change
define net force
determines resulting acceleration
force is a ______ quantity
vector
define free body diagram
illustrates force’s magnitude and direction
define newtons first law
an object at rest will stay at rest unless acted upon by a nonzero net force
define inertia
an object’s tendency to remain in its state of motion
define newtons second law
acceleration is directly related to net force and inversely related to mass
Fnet=
MAgravity
what is newton’s third law
for every action there is an equal opposite reaction
F=
G(m1m2/r^2)
G=
6.67X10^-11 Nm^2/kg^2
gravitational force
weight that earth exerts on an object
define normal force`
physical contact between 2 objects that point perpendicular to the plane of the surface
define apparent weight
scale displays the magnitude of normal force it exerts on a person
define friction
interaction between molecules on 2 separate surfaces
define kinetic friction
acts when a body slides over a surface
define static friction
acts when there is no relative motion between bodues
what is the direction of force
opposite of the motion of object
what is the acceleration when an object is in equilibrium
0
define energy
ability to do work
define kinetic
energy related to motion, nonzero velocity
define potential
energy related to position and force upon an object
KE=
1/2mv^2
