Task 3. Complete the sentences using the words in the box. You will need to use one word twice.compression, deformation, elongation, extension, tension1. A stretching force is called2. A crushing force is called3. Extension is also called4. Tension causes .. or5. Tension or compression causeTask 4. Match the tivo parts to make correct sentences.1. If a material is stiff2. If a material is brittle-3. If a material is plastic4. If a material yields5. If a material fractures6. If a material is elastically deformed ...a) it is malleable and/or ductile.b) it has low elasticity and low tensile strength.c) it has low elasticity and high tensile strength.d) it has been extended to a point before its elastic limit.e) it has been loaded beyond its ultimate tensile strength.1) it has been significantly plastically deformed, but not broken.​

1. A stretching force is called tension.
- Tension is a force that pulls or stretches an object apart.

2. A crushing force is called compression.
- Compression is a force that squeezes or presses an object together.

3. Extension is also called elongation.
- Extension refers to the increase in length of an object, usually due to stretching or pulling forces.

4. Tension causes elongation or deformation.
- When a force of tension is applied to an object, it can cause the object to lengthen or deform in shape.

5. Tension or compression cause deformation.
- Both tension and compression forces can cause an object to change its shape or deform.

Task 4. Match the two parts to make correct sentences.

1. If a material is stiff, it has low elasticity and high tensile strength.
- Stiff materials are not very flexible but can withstand high pulling forces.

2. If a material is brittle, it fractures when loaded beyond its ultimate tensile strength.
- Brittle materials are prone to breaking when subjected to high forces, especially beyond their maximum strength.

3. If a material is plastic, it is malleable and/or ductile.
- Plastic materials can be easily bent, stretched, or molded into different shapes without breaking.

4. If a material yields, it has been extended to a point before its elastic limit.
- Yielding refers to when a material starts to permanently deform after being stretched, but it has not reached its breaking point.

5. If a material fractures, it has been loaded beyond its ultimate tensile strength.
- Fracturing occurs when a material breaks apart due to excessive forces applied to it.

6. If a material is elastically deformed, it has been significantly plastically deformed but not broken.
- Elastic deformation refers to when a material changes shape under a force but can return to its original shape once the force is removed. It involves significant plastic deformation but does not lead to breaking.