SYSTEM OF

FORCESM. S. KHAN

01

TABLE OF CONTENTS

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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).

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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

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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

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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

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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

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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

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NON-COPLANAR FORCE SYSTEM

Concurrent Parallel General

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