schip666!
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After all this recent talk of torque and power I figure I can post my stupid question of the week:
How does torque relate to inertia?
Say I have a nice balanced wheel that I want to spin. I can calculate the moment of inertia but I'm too old to remember how to figure out how much torque and/or power I need to over come the inertia (and friction) to get it going. I got stalled here in dimensional analysis:
moment of inertia == kg·m²
energy (joules) == kg·m²/s² (Newton-meters)
torque == joules/radian == kg·m²/s² (same as energy but through X degrees of rotation)
From wiki: A torque of 1 N·m applied through a full revolution will require an energy of exactly 2(pi) joules.
So, now ignoring friction, can I figure that the driving torque just influences the acceleration? And then it's only friction that keeps my wheel from spinning when the motor is too small?
How does torque relate to inertia?
Say I have a nice balanced wheel that I want to spin. I can calculate the moment of inertia but I'm too old to remember how to figure out how much torque and/or power I need to over come the inertia (and friction) to get it going. I got stalled here in dimensional analysis:
moment of inertia == kg·m²
energy (joules) == kg·m²/s² (Newton-meters)
torque == joules/radian == kg·m²/s² (same as energy but through X degrees of rotation)
From wiki: A torque of 1 N·m applied through a full revolution will require an energy of exactly 2(pi) joules.
So, now ignoring friction, can I figure that the driving torque just influences the acceleration? And then it's only friction that keeps my wheel from spinning when the motor is too small?