PASCO ME-9502 Statics System - Manual (Page 78)

S t a t i c s S y s t e m E x p . 1 2 : S i m p l e M a c h i n e s – T h e L e v e r
®
74 012-12876B
2. Mount a Large Pulley and Spring Scale at one end of the Balance Arm and use thread to connect the Spring
Scale to the Protractor on the Balance Arm.
3. Use thread to hang a mass hanger from the other Protractor and add 200 g of mass to the hanger.
4. Adjust the Large Pulley and the Spring Scale so that the Balance Arm beam is horizontal and level.
Procedure
1. Make and record the necessary measurements to show that the torques produced by the Spring Scale and the
weight of the Hanging Mass are balanced.
2. Use a pencil or dry erase marker pen to outline the base of the Spring Scale and the position of the top of the
Hanging Mass on the Statics Board.
3. Slowly push the Spring Scale upward. (If you perform this movement slowly enough, the reading on the
Spring Scale will not vary appreciably.)
4. Mark the new positions of the Hanging Mass and the Spring Scale.
5. Measure and record the distances, d
1
(distance Hanging Mass moved) and d
2
(distance Spring Scale moved).
Also record F
2
, the reading on the Spring Scale, and M
1
and W
1
, the mass and weight of the Hanging Mass.
6. Move the protractor with the hanging mass to a new location about halfway to the pivot point and repeat the
experiment. Measure and record the new values for d
1
, d
2
, and F
2
.
Figure 12.3: Raise the Spring Scale
Spring
Scale
Pivot
d
2
Protractor
Large
Pulley
Hanging
Mass
Thread
Outline
d
1
F
2
M
1