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SYSTEM OF
FORCESM. S. KHAN
01
TABLE OF CONTENTS
02
03
04
05
Concept of force
Characteristics of force
Force classification
Force system
Force system classification
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).
2
CHARACTERISTICS OF FORCE
θ
Line of action
Point of application
𝑥¿
𝑦 ¿
𝑦 (−)
𝑥 (−)
DirectionMagnitude
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
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
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
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
FORCE SYSTEM
7
DefinitionWhen number of forces act
simultaneouslyon a body then they are said to form
a force system
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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
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COPLANAR FORCE SYSTEM
Concurrent Parallel General
10
NON-COPLANAR FORCE SYSTEM
Concurrent Parallel General
THANK YOU
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