Lab 1: Rotational Collisions

Lab 1: Rotational Collisions ( supplements )

Courtesy of Benli Young

All given numbers of measured data are for your reference only. You have to correct them into the right value with significant figures if you think any of those numbers is incorrect!

It is better you review my supplemental note of Lab8 of Phys2A LAB or Phys40A.

Procedure 1

Select " smart pully timer " -- " motion timer " -- " release the platter " -- " graph data " ---- select " E : rotational apparatus " -- " velocity vs. time "

The slope is " a ", angular acceleration.

m : the total hanging mass

r : the radius of the middle step

g = 9.80 (m/sec²) or 9.80 x 10² (cm/sec²)
(I_total+ mr²) _measured = mgr / a

object	m, UNIT:( )	r, UNIT:( )	a, UNIT:( )	mgr, UNIT:( )	mr², UNIT:( )	(I_total+ mr²)_measured, UNIT:( )	I_total, UNIT:( )
I_Platter	100	2
I_Platter+I_Ring	100	2
I_Platter+I_bar	100	2
I_Platter+I_Platter	100	2

I_Platter = _______________ , I_bar = _______________

I_ring = _______________ , I_AuxPlatter = _______________

Procedure 4

Print out a graph of ¡§angular velocity vs. time¡¨.
L_i = I_iw_i , I_i is the moment of inertia for moving object.
L_f = I_fw_f , I_f is the moment of inertia for moving and dropping object.
DL = L_f - L_i

Moving Object	Dropping Object	w_i rad/s	w_f rad/s	L_i kg-m²/s	L_f kg-m²/s	DL/L_i x 100%
I_Platter	I_Platter
I_Platter + I_ring	I_Platter
I_Platter+I_bar	I_Platter
I_platter	I_bar
2 I_platters	I_bar

DK = K_f - K_i

K_i = (1/2)I_iw_i²

K_f = (1/2)I_fw_f²

Moving Object	Dropping object	w_i rad/s	w_f rad/s	K_i joules	K_f joules	DK/ K_i x 100%
I_Platter	I_Platter
I_Platter+I_Ring	I_Platter
I_Platter+I_Bar	I_Platter
I_Platter	I_Bar
2 I_Platters	I_Bar

Answer the questions.

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