Motion in A Plane

Physics Part I

Physics

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A body is projected with kinetic energy 100J at an angle 45Â° with horizontal. What fraction of kinetic energy will be the potential energy at the highest point?

If a body is projected with kinetic energy K at angle Î¸, then kinetic energy at highest point is K cos

Therefore, potential energy of the body at highest point is,

P.E. =Â Â

Fractional potential energy at highest point is,Â

Â Â Â Â Â Â Â Â Â

Here, we have

K = 100 J and Â Â

Fractional potential energy at highest point is,Â

Â Â Â Â Â Â Â Â Â Â Â Â

At the highest point, K.E will be 0.5 times the P.E at the highest point.Â

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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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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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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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