![](../img/shm_setup.jpg)
Room setup |
![](../img/shm_detail.jpg)
Photogate position relative to track |
![](../img/shm_spring1.jpg)
One end loop of spring is slightly smaller than the other
(in picture above, the left side is smaller) |
![](../img/shm_spring2.jpg)
Attach spring to cart by placing the smaller end
into the slot on the cart. . . |
![](../img/shm_spring3.jpg)
. . . then hold spring in place with screw |
![](../img/shm_attach1.jpg)
Spring attachment |
![](../img/shm_attach2.jpg)
If cart with plunger is used, attach spring
to plunger release |
![](../img/shm_attach6.jpg)
The left stop is positioned at 100 cm mark;
attach larger loop of spring to screw |
![](../img/shm_attach5.jpg)
The right stop is positioned at the
200 cm mark |
![](../img/shm_attach4.jpg)
Small hook (actually a bent paper clip) on
string is attached to screw on cart |
![](../img/shm_mass.jpg)
The loop end of string is placed over pulley;
small masses will be suspended from loop |
![](../img/shm_stuff.jpg)
Small screw, 500 g mass block, small masses with hooks;
place all masses on bench near track |