Stress and Strain checkpoint

(a)   describes the force felt per unit area of a loaded sample

The force pulling on a sample of material is called the (a)  

A sample is placed under load. If it is replaced with a sample of the same material but half the cross sectional area, the stress will be....

• doubled

• halved

• the same

• zero

If the load on a sample is doubled, the stress will...

• increase by 1

• be halved

• stay the same

• be doubled

The distance by which a sample gets longer when pulled by a load is called (a)  

Strain is the name given to the ratio of extension to (a)   length

Valid units of stress include:

• Newtons per meter

• newtons per square meter

• Pascals

• Gigapascals

• It has no unit

Valid units of strain include:

• Newtons per square meter

• bread

• Meters

• Pascals

• It has no unit

For a given material under a fixed load, strain will vary depending on the length of the sample

• True

• False

• Sometimes

Strain could be expressed as a decimal or percentage

• True

• False