Chapter Chosen

Motion in A Plane

Book Chosen

Physics Part I

Subject Chosen

Physics

Book Store

Download books and chapters from book store.
Currently only available for.
CBSE Gujarat Board Haryana Board

Previous Year Papers

Download the PDF Question Papers Free for off line practice and view the Solutions online.
Currently only available for.
Class 10 Class 12

A particle moves from point (2, 3, 5) to (8, -4, 2) when a force of 3 straight i with hat on top minus 7 straight j with hat on top minus straight k with hat on top unit is applied on it. Find the work done by the force.


Given, a particle moves from point P(2,3,5) to Q(8,-4,2). 

Force applied on th particle, F = 3 straight i with hat on top minus 7 straight j with hat on top minus straight k with hat on top 

Therefore, the displacement undergone by the particle is, 
             straight S with rightwards arrow on top space equals space left parenthesis 8 minus 2 right parenthesis straight i with hat on top plus left parenthesis negative 4 minus 3 right parenthesis straight j with hat on top plus left parenthesis 2 minus 5 right parenthesis straight k with hat on top 

                equals 6 straight i with hat on top minus 7 straight j with hat on top minus 3 straight k with hat on top 

Therefore work done by force is, 

 straight W equals straight F with rightwards arrow on top times straight S with rightwards arrow on top space equals space left parenthesis 3 straight i with hat on top minus 7 straight j with hat on top minus straight k with hat on top right parenthesis times left parenthesis 6 straight i with hat on top minus 7 straight j with hat on top minus 3 straight k with hat on top right parenthesis 

              equals 18 plus 49 plus 3 equals 70 J

 

150 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. 


814 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

Give three examples of scalar quantities.

Mass, temperature and energy
769 Views

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