3.2. Stress

Try these first

1. 1.

   What is an example of a traction force?

   Hint

   Think of objects resting on surfaces.

2. 2.

   Define body force.

   Hint

   Consider forces like gravity.

3. 3.

   What is torque caused by?

   • Group of forces acting on a single point
   • A single force acting at a distance
   • None of the above

   Hint

   Think about how a wrench works.

4. 4.

   True or False: Body forces are only external forces.

   • True
   • False

   Hint

   Remember the role of gravity.

5. 5.

   A vertically hanging cylindrical bucket is filled with water to a height of 2m. Calculate the pressure at the bottom of the bucket in terms of water density.

   Hint

   Use the water density and remember that pressure increases with depth.

6. 6.

   A cuboid experiences a tension force on one face while being acted upon by gravity throughout its volume. Derive the expression for the resulting stress matrix.

   Hint

   Balance forces and integrate across the volume.