2.4 Addition of a System
of Coplanar Forces
Example: Consider three coplanar forces
Cartesian vector notation
F1 = F1x i + F1y j
F2 = F2x i + F2y j
F3 = F13x i F3y j
2.4 Addition of a System
of Coplanar Forces
Cartesian vector notation:
F1 = F1x i + F1y j

HES2310 - Dynamics-1
Jamal Naser
Senior Lecturer
ATC842
Ext: 8655
Swinburne University
NB: These lecture notes are prepared from Engineering
Mechanics- Dynamics (the book by J.L. Merium & L.G.
Kraige). These notes will help the students to follow lectures

Tutorial -1: Force Vectors
1. Determine the magnitude of the resultant force and its direction, measured
counterclockwise from the positive x axis. (Ans: FR = 546 N, = 253 )
2. Determine magnitude of the resultant force and its direction, measured counter

CVE10004
Mechanics of Structures
REVISION
[A]
Unit 1: Forces and equilibrium
Problem 1
[Resolution of force]
The force F = 900 N acts on the frame shown
in Figure 1.
Resolve this force into
components acting along members AB and
AC, show the direction of

Tutorial 2A: Equilibrium of a rigid body
Problem 1
The box wrench in Figure 1 is used to tighten the bolt at A. If the wrench does not turn when
the load is applied to the handle, determine the torque or moment applied to the bolt and the
force of the wre

Unit 1b: Forces & Equilibrium
(Equilibrium of a Rigid body)
Equilibrium of a Deformable Body
Equilibrium
Equilibrium of a body requires both a balance of
_
external and _
internal forces to prevent a body
from having accelerated motion; and a balance of
m