It means size of the force

It is sum of all forces acting on a body.

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If 2 forces act in same direction,
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Magnitude of force increases

It is the sum of of both forces

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If 2 forces act in different direction,
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Magnitude of force decreases

It is the difference of both forces

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Example 1 - If 2 forces act in same direction,
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Suppose 2 persons are pushing car from back

Person 1 exerts force of X

Person 2 exert force of Y

Total Force exerted on car = X + Y

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Example 2 -
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If 2 forces act in different direction,
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Magnitude of force decreases

It is the difference of both forces

Suppose 2 persons are pushing car one from back other from front

Person 1 exerts force of X

Person 2 exert force of Y

Total Force exerted on car = X - Y

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