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Class 10 Class 12
Two forces have magnitude in the ratio 5:12. If the angle between them is 90°, they give the resultant of magnitude 26N. Find the magnitude of resultant force if the angle between them is changed to 120°.

Let magnitude of two forces be F1and F2.

Here,

...(1)

The resultant of  is 26N when angle between them is .

Therefore,

...(2)

Substituting,  in equation (2),

∴

Let R be the magnitude of the resultant when the angle between the two forces is

∴

i.e.,                   , is the magnitude of the resultant between the vectors.
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Give three examples of scalar quantities.

Mass, temperature and energy
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What is a vector quantity?

A physical quantity that requires direction along with magnitude, for its complete specification is called a vector quantity.
835 Views

Give three examples of vector quantities.

Force, impulse and momentum.
865 Views

What is a scalar quantity?

A physical quantity that requires only magnitude for its complete specification is called a scalar quantity.
1212 Views

What are the basic characteristics that a quantity must possess so that it may be a vector quantity?

A quantity must possess the direction and must follow the vector axioms. Any quantity that follows the vector axioms are classified as vectors.

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