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Motion in A Plane

Physics Part I

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Two particles which are initially at rest, move towards each other under the action of their internal attraction. If their speeds are v and 2v at any instant, then the speed of centre of mass of the system will be

• 2v

• 0

• 1.5 v

• v

B.

0

As initially, both the particles were at rest, therefore, velocity of the centre of mass was zero and there is no external force on the system so the speed of the centre of mass remains constant i.e, it should be equal to zero.

As initially, both the particles were at rest, therefore, velocity of the centre of mass was zero and there is no external force on the system so the speed of the centre of mass remains constant i.e, it should be equal to zero.

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What is a scalar quantity?

A physical quantity that requires only magnitude for its complete specification is called a scalar quantity.
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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.
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Give three examples of vector quantities.

Force, impulse and momentum.
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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.Â

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