-Define the system,Sometimes called a force diagram.
-Sketch the system.
-Used by engineers & physicists to analyze the forces
& moments acting on a body.
-Show the interactions with forces & torques.
-To analyze a problem in statics or dynamics.
-Show the relative magnitude & directions of all
forces acting on an object.
Take a my Iphone 5 & drop it.
Diagram the forces acting on
In this diagram,
forces on my
An egg is free-falling from a nest
in a tree. Neglect air resistance.
Draw a free-body diagram
showing the forces involved.
Gravity is the
as it falls.
A rightward force is applied to
my Iphone 5 in order to move it
across a desk. Consider
frictional forces. Neglect air
resistance. Construct a freebody diagram. Let’s see what
this one looks like.
Note the applied force arrow pointing to the
right. Notice how friction force points in the
opposite direction. Finally, there is still gravity
and normal forces involved.
1. Draw Outlined Shape
2. Show All Forces and Couple Moments
3. Identify Each Loading and Give
Draw the free-body diagram of the uniform
beam.The beam has a mass of 100kg.
If a support prevents the translation of a body in a given
direction, then a force is developed on the body in that
If rotation is prevented, a couple moment is exerted on the
Forces on an Object
External and internal forces can act on a rigid body
For FBD, internal forces act between particles
which are contained within the boundary of the
FBD, are not represented
Particles outside this boundary exert external
forces on the system
Draw the free-body diagram of the unloaded platform that is
suspended off the edge of the oil rig. The platform has a mass
of 200 Kg.
Two- and Three-Force Members
Some objects can be two or three force members.
When forces are applied at only two points on a
member, the member is called a two-force
Only force magnitude must be determined
When subjected to three forces, the forces are
concurrent or parallel
Thanks all of You....Have a nice day...
This presentation is prepared by
SHAHRIAR MUJTAHID HOSSAIN