Expansion joint

High school (ages 12+)
Science & Technology

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/expansion-joint

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the scientific principle?Accommodates thermal expansion and contraction of materials due to temperature changes
2. What is the key structural applications?Bridges, buildings, railway tracks, piping systems, and large concrete structures
3. Why do buildings and bridges need expansion joints?When it gets hot or cold, the materials expand or shrink. Expansion joints let that movement happen safely so the structure doesn’t crack or break.
4. How do expansion joints help keep bridges from cracking?The joint acts like a cushion that absorbs the extra length or shrinkage, so the bridge stays strong and doesn’t develop cracks.

Thermal Expansion Coefficient: A measure of how much a material's volume changes per degree of temperature change.
Seismic Activity: Earthquakes or ground shaking that requires structures to withstand dynamic forces.
Differential Settlement: Uneven sinking of a building's foundation, causing stress and potential cracking.