mechanics Flashcards
what is the equation for the moment?
MECHANICS
moment = Fd
where:
• F = force perpendicular to distance
• d = distance to pivot
what is the equation(s) for work done [or energy transferred]?
MECHANICS
work done = Fs
or
work done = Fscosθ
where:
• F = force
• s = displacement
• θ = angle between line of action of force and line parallel to ground
what is the equation for velocity?
MECHANICS
v = Δs / Δt
what is the equation(s) for acceleration, using: v and t?
MECHANICS
a = Δv / Δt
what are the suvat equations (only use suvat if there is acceleration)?
MECHANICS
v = u + at
v^2 = u^2 + 2as
s = ut + 0.5at^2
s = vt - 0.5at^2
s = 0.5(v - u)t
what are the equations for average speed?
MECHANICS
average speed = d / t
or
s = 0.5(v - u)t
in projectiles, what components of the speed do you use and what components do you not use?
MECHANICS
in projectiles you use: vertical component of speed
in projectiles you do not use: horizontal component of speed
what is the equation for newton’s second law?
MECHANICS
F = ma
or
F = m(Δv / Δt)
what is the equation for force, using: m, v and t?
MECHANICS
F = (Δmv) / Δt
or
F = Δp / Δt
what is the equation(s) for impulse?
MECHANICS
impulse = Δmv
or
impulse = Δp
or
Δmv = FΔt
or
Δp = FΔt
what is the equation force when looking at fluids moving through a pipe / conveyor (belts)?
MECHANICS
F = v(Δm / Δt)
what is the equation for kinetic energy?
MECHANICS
KE = 0.5mv^2
what is the equation for gravitational potential energy?
MECHANICS
GPE = mgh
or
ΔGPE = mgΔh
(do NOT use this equation in gravitational fields topic, bc equation is only good for constant g)
what is the equation for power?
MECHANICS
P = E / t
where:
• P = power
• E = energy transferred
• t = time
what is the equation for power developed?
MECHANICS
P = Fv
where:
• P = power
• F = force
• v = velocity
