AQA A level Solids Under Stress

Linear strain is defined as:

• Ratio of change in length to original length.

• Force per unit cross sectional area.

• Decrease in length.

• Pressure on a material from a load.

What is the correct unit for stress:

• newton

• pascal

• no unit

• newton/metre

Stress =

Given the Young's modulus of elasticity below rank the metals according to the least strain for the same load. Rank from highest to lowest.

Aluminum 69 GPa

Brass 125 GPa

Steel 200 GPa

• Aluminium, Brass, Steel

• Aluminium, Steel, Brass

• Brass, Steel, Aluminium

• Steel, Brass, Aluminium

If you apply a force to deform a material then remove the force and the material returns to its original shape this is

• Elastic deformation

• Plastic deformation

• Ductile deformation

• Malleable attrition

If you apply a force to deform a material then remove the force and the material returns to its original shape this is

• Elastic deformation

• Plastic deformation

• Ductile deformation

• Malleable attrition

What is 0.2 mm² in m²

•  2 x 10^-7

• 2 x 10^-3

• 200

• 2 x 10^-4

Calculate the stress when a force of 1000 N acts over a circular wire of diameter 0.2 m? (In pascals to 2 sf)

A 2 m wire extends by 4 mm, the strain is:

• 0.5

• 2 x 10^-3

• 2 x 10^-6

• 0.005

What is the Youngs Modulus if a stress of 24 MPa causes a strain of 0.003?

• 8 MPa

• 8 kPa

• 8 GPa

• 8 TPa