The document defines force as a vector quantity arising from the interaction between objects, with a unit measurement in newtons. It classifies forces into contact forces and body forces, detailing various types such as applied, drag, frictional, and gravitational forces. Additionally, it explains the concept of a force system and distinguishes between coplanar and non-coplanar force systems.

1. SYSTEM OF
FORCES
M. S. KHAN

2. 01
TABLE OF CONTENTS
02
03
04
05
Concept of force
Characteristics of force
Force classification
Force system
Force system classification

3. CONCEPT OF FORCE
1
• A force is a push or pull upon an object resulting from the
object’s interaction with another object.
• It is a vector quantity (having both magnitude & direction).
• The unit of force is newton (N).

4. 2
CHARACTERISTICS OF FORCE
θ
Line of action
Point of application
𝑥 (+)
𝑦 (+)
𝑦 (−)
𝑥 (−)
Direction

5. 3
FORCE CLASSIFICATION
FORCE
Contact Force Body Force
It is produced by direct
physical contact between
objects.
It is produced when an
object is located within a
force field.
• Applied force
• Drag force
• Frictional force
• Normal force
• Spring force
• Tension force
• Gravitational force
• Electrical force
• Magnetic force

6. 4
CONTACT FORCE
Applied Force
It is a force that is applied to an object by a
person or another object
Drag Force
It is a force that is experienced by an object
when it is moving through a fluid
Frictional Force
It is a force that is resisting the relative
motion of objects sliding against each other

7. CONTACT FORCE
5
Normal Force
It is a force that is acting perpendicular to
the surface of object
Spring Force
It is a force that is exerted upon an object by
a compressed or stretched spring
Tension Force
It is a force that is exerted by a cable, rope,
chain or string when they are subjected to pull

8. 6
BODY FORCE
Gravitational Force
It is a force that causes massive objects to
pull other objects towards them
Electrical Force
It is an attractive or repulsive force between
two charged objects
Magnetic Force
It is an attractive or repulsive force between
two magnetic objects

9. FORCE SYSTEM
7
Definition
When number of forces act simultaneously
on a body then they are said to form
a force system

10. 8
FORCE SYSTEM CLASSIFICATION
FORCE SYSTEM
Coplanar Non-coplanar
Line of action of all
the forces lie on same
plane
Line of action of all
the forces does not lie
on same plane

11. 9
COPLANAR FORCE SYSTEM
Concurrent Parallel General

12. 10
NON-COPLANAR FORCE SYSTEM
Concurrent Parallel General

13. THANK YOU