Student Handout
General Activity Contract
| Part Description | Notes | Download |
|---|---|---|
Spring Scales  |
We modified Rapala-brand (15-lb (7 kg)) spring scales by replacing the hook with a stainless steel rod. A washer having a13mm inside diameter and 27mm outside diameter was welded to one end of the rod,and the other end was threaded to accept the as-supplied retaining nut. As supplied, the scale read in "kg" and “lb”. We made a replacement label (see below) so it would read in Newtons (N), a proper unit of force. Quantity: 4 |
PDF File |
Metal Ring (Circular Carabiner)  |
The ring allows up to 4 spring scales to be attached simultaneously. We used a40mm-diameter aluminum carabinerring. It is sufficiently sturdy provided that the spring scale forces are limited to “5 kg”. Quantity: 1 |
PDF File |
Spring Scale Label  |
This label can be printed on self-adhesive paper and attached to the body of the spring scale so that it reads in Newtons (a proper unit for force). Quantity: 1 |
PDF File |
Protractor  |
The protractor is used to measure the angles between the spring scales. Quantity: 1 |