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Unit 1 - Mechanics and Materials
all the formulas and some definitions, tell me if you know anymore :)
32
Physics
12th Grade
12/29/2010

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Term
Speed =
Definition
distance/time
(m/s)
Term
velocity =
Definition
displacement/time
(m/s)
Term
acceleration =
Definition
(v-u)/t
(m/s²)
Term
displacement (s) =
Definition
ut+1/2at² OR
t(v+u)/2
(m)
Term
v² =
Definition
u²+2as
Term
volume of a sphere =
Definition
4/3πr³
Term
Force =
Definition
mass x acceleration
(N)
Term
gravitational field strength =
Definition
F/m
Term
Weight =
Definition
mass x gravity
(N)
Term
work done =
Definition
force in direction of movement x distance moved
(Joules)
Term
kinetic energy =
Definition
1/2mv²
(Joules)
Term
gravitational potential energy =
Definition
mass x gravity x height
(Joules)
Term
Efficiency =
Definition
(useful energy/time)/power input
useful energy output/total energy input x100 (percentage)
Term
density (p) =
Definition
mass/volume
Term
Power =
Definition
work done/time taken
energy transferred/time taken
force x velocity
(Watts)
Term
1 Horsepower =
Definition
750 Watts
Term
upthrust =
Definition
weight of fluid displaced
Term
Weight of water displaced =
Definition
density x volume x gravity
(mass x gravity)
Term
laminar/streamline flow =
Definition
lower speeds
constant speeds within streamlines
predictable flow
less drag
Term
turbulent flow =
Definition
higher speeds
unpredictable velocity
streamlines crossover
eddies/currents may form
more drag
Term
Terminal Velocity (with small sphere) =
Definition
2r²g(ps - pf)/9n
Term
Hookes Law
f=
Definition
-k x x
Term
Elastic strain energy =
Definition
1/2Fx
1/2kx²
Term
Tensile/Compressive stress =
Definition
force/cross sectional area
(Pascals)
Term
Tensile/Compressive strain =
Definition
extention/original length
Term
Young's Modulus =
Definition
stress/strain
Term
DUCTILE
Definition
plastic deformation - stretch into wires
Copper - Wires
Term
DUCTILE
Definition
plastic deformation - stretch into wires
Copper - Wires
Term
BRITTLE
Definition
break/crack with little deformation BUT doesn't mean weak
Glass
Term
TOUGH
Definition
ability to withstand impact, require a large force for small plastic deformation, ability to absorb energy.
Rubber
Term
HARD
Definition
resist plastic deformation (dents/cuts)
Diamond drill bits
Term
MALLEABLE
Definition
large plastic deformation before breaking
Gold Gilding
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