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system can be
single object/particle, collection of particles, region of space, varying in size and shape
unisolated system
exchange with something that is not part of the system (e.g. if system is just a block, friction from the table makes it unisolated)
energy transfers into a system through
mechanical work
W = (sum of energies)
ΔΚ + ΔU + ΔEinternal
mechanical energy is conserved in
an isolated system with no non-conservative forces
speed of pendulum at bottom
√2gL(1-cosθ)
tension in rope at bottom of pendulum
mg(3-2cosθ)
Wfriction =
ΔK + ΔU = sum of non-conservative work
power
time rate of energy transfer; P = ΔW/ΔT
average power
W/Δt
instantaneous power
dW/dt
1 horsepower =
746 W
P in terms of v
F→ • v→