Physics I Lab Manual 2011 83

Physics I Lab Manual 2011 83 - EXPERIMENT 11. ROTATIONAL...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
EXPERIMENT 11. ROTATIONAL DYNAMICS 3. Moment of inertia. The moment of inertia can be calculated from I = τ α with uncer- tainty δI = I r ± δτ a τ a ² 2 + ( δα α ) 2 . Compute your experimental value for the inertia of the disk from the applied torque found in step 2 and the acceleration found in step 9 of the procedure and compare it to the calculated value found by summing that of the pulley (disk) and the bar: I disk = 1 2 m d r 2 d and I bar = 1 12 m b ( L 2 + w 2 ) 2 . Do these values agree within the experimental uncertainty? 4. Finally, check the work-energy relation, which state the total work done on a system equals the change in kinetic energy. There are two forces (gravity and friction) that do work on the system as the disk is spinning up: W g = mgh where h = Δ θr is the height the load mass fell while the spool was unwinding, and W f = - τ f Δ θ , where τ f = | I Δ α/ 2 | . The change in kinetic energy also has two terms (one for the rotation
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.
Ask a homework question - tutors are online