Forces and Structure
changes or tries to change the
shape or movement of a body.
A force can cause a body to
accelerate. The actual acceleration of the body depends on the sum of all forces acting on it.
Every force acts in a particular direction.
Forces are measured in newtons.
Example:A heavy object on a table is pulled down toward
the floor by the force of gravity (i.e., its weight), but it
doesn┤t move because there is a equal force pushing up
A pushing force that tries to shorten a structural element
||2║ Tension. A pulling forces
that tries to make a structural element longer
Forces that cause twisting
||4║ Shear. Sliding forces
that act in opposite directions
|Bending is a action
caused by a perpendicular force. A structural element subjected to bending is
known as a beam.
Exercice 1║. Which type of force appears in:
2║ Which type of force
b) a tree trunk
c) a drill bit
d) a door handle
e) a well rope
3║ Let┤s go to learn a bit more about
forces. We will visit the bbc web page about Pushing and Pulling forces.
Push and Pull
Sliding: to move along in
continuous contact with a smooth surface
drill bit are cutting tools used to
create cylindrical holes. Bits are held in a tool called a drill, which
rotates them and provides axial force to create the hole
Door handle A doorhandle is the
device mounted on the exterior and interior of automobile doors for the
purpose of opening them