April 14, 2016
2.3 Internal Forces p 296
Compression - tension - shear - complementary forces
April 14, 2016
2.3 Internal Forces p 296
An internal force is a force that one part of a structure
exerts on other parts of the structure.
Think about the forces being
exerted on all the acrobats
in the picture.
Compression - tension - shear - complementary forces
April 14, 2016
2.3 Internal Forces p 296
Compression is a force that acts to squeeze an object or
push parts within an object together.
examples - human body (joints), chairs,
shelves, columns
Compression - tension - shear - complementary forces
April 14, 2016
2.3 Internal Forces p 296
Tension is a force that acts to stretch and pull apart
something.
examples - ski lifts, hydro towers, running
shoes, suspension bridges
Compression - tension - shear - complementary forces
April 14, 2016
2.3 Internal Forces p 296
Shear is a force that acts to push parts that are in contact
with each other in opposite directions.
examples - doors, airplanes, scissors
Compression - tension - shear - complementary forces
April 14, 2016
2.3 Internal Forces p 296
Complementary forces are when different internal
forces act on a structure.
Compression - tension - shear - complementary forces
April 14, 2016
2.3 Internal Forces p 296
Internal forces in bridges - Bill Nye
Start at 18:00 - lasts about 12 minutes
Compression - tension - shear - complementary forces
April 14, 2016