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Looks at the elastic properties of (1) springs, (2) a copper wire and (3) a rubber tube. In part (1) the student measures the spring constants for (a) three single springs, (b) a two spring system where the springs are hung in parallel and (c) a two spring system where the springs are hung in series.

In part (2), the student measures Young's modulus for copper and prepares a stress vs. strain graph from the data; on the graph the students identify the elastic region, the elastic limit, the plastic region, the region of creep and the fracture point.

In part (3), the student measures Young's modulus for rubber and prepares a stress vs. strain graph; on the graph the student identifies the area of hysteresis.

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Equipment

Number of set-ups available: 1 Per lab station: Copper Wire Setups: 1 balance/standard mass set 1 micrometer caliper 10 kg slotted masses 10 0.5 kg slotted masses 1 2 meter meterstick 1 dial micrometer 1 copper wire (20 gauge)/hanger 1 box/foam pad 1 meterstick/post 1 apparatus frame (1 C-clamp, 3 ring stand clamps, large post, 1 test tube holder/stopper) Spring and Rubber Tubing Setup: 1 comparitor-magnifier 1 spring set 1 rubber tube/hooks 2 metersticks/posts 5 200 gm hooked masses 5 100 gm hooked masses 1 small piece of rubber tubing 2 paper clips 1 apparatus frames (1 C-clamp, 3 ring stand clamps, 2 hooked rings 2 large posts)

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