A-LEVEL PHYSICS: 11.1.8: Rotational Work & Power (SaveMyExams) Flashcards
work has to be done on a rigid body when a ___ turns in through an angle about the ___.
torque, axis
work done (linear) =…
W = Fd
Force applied * distance moved
work done (angular) = …
W = τθ
area under τ-θ graph:
work done (W)
how can you find work done (W) from a τ-θ graph?
area
area under F-d graph:
work done (W)
power is the rate of…
energy transfer
/
work done
power (P) = …
P = ΔW/Δt = Δτθ/Δτ = τ(Δθ/Δτ)
∴ P = τω
in rotational mechanics, frictional forces produce a specific torque called…
frictional torque
frictional torque:
torque caused by the frictional force when 2 objects in contact move past each other
frictional torque can be defined as:
the difference between the applied torque and the resulting net, or observed, torque
net torque = …
τnet = τapplied + τfrictional
in rotating machinery, ___ must be increased to overcome frictional torque
power
how do you overcome frictional torque in rotational machinery?
increase power
when a screwdriver is gripped & turned, this ___ its…
increases, rotational kinetic energy
