·
object at rest stay at rest G object in motion stays in motion
unless acted upon by an OUTSIDE FORCE "LaW Of INERTIA"
Newton's second Law :
-
·
accerulation of object to force applied a to mass F =
m . Newtons
Newton's Third Law :
·
every action has EQUAL a OPPOSITE reaction
Center of Mass :
·
If force applied & CENTER OF MASS -
Object will move as
NT
·
If force OT &
applied ROTATE
CENTER - Object Will
Torque :
·
twisting force causes rotation
·
CLOCKWISE = (-) z= F -
& N mjoule
.
·
Farther from center of mass > LESS FORCE needed -
Work on
Energy : W = F - d
·
Energy transferred by a force (WORK)
·
Ability to do work (ENERGY) W = F dS.
O
KE = Emv2 PE = mgh
Law of Conservation of Energy :
PEi + KEi =
PEf +
KEf
bottom of hill ?
m
speed &
Initial E = PE = (90) (9 8) (500 sin (5)
.
= 38, 4555
Final E =
Ei-Efriction
sin(5) to
= Efriction = 60N 500 m
-
= 30, 00 0
500sIn (5) = h
Efinal 84555 = :
[mr > -
v= 13 7
. M/s
, Hooke's Law (SPRINGS) : F =
-
kX
·
force applieda distance
E = kX2
wi wit
original compressed
Conserative Force (Gravity , Spring)
WORK done only dependsOn INITIALG FINAL positions ,
NOT path
·
Nonconserative Force
·
depends on PATH (Friction, Air resistance)
Power :
P Jonese P=F
·
Rate at which someonesomething does work
Pascal's Principle :
>
-
pressure
-
F
at rest : P=
CHANGE EVERY PORTION
-
> pressure
-
in One part transmitted to
Po ·
electrical conductivity measure of How
=
material
easily
current can more through a
> SMALLER AREA
larger force on
larger area
-
↳ pressureight
Archimede's Principle :
·
any object COMPLETELY/PARTIALLY submerged & rest Is Fyou " gVg
.
acted by BOYANT FORCE equal to
weight of fiuld
nu
Object ION but Fbouy PVg Object SINKS
·
Is = :
NON .
#
↓
ION
IWATERI ofcube? ON =
(1000)V(9 8) .
·
PCPH20
Object FLOATS :
= 8 2x10-4 m3
.
PLPH28
%o submerged
Volumea
=