Zigya Logo

Chapter Chosen

Work, Energy and Power

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
Underline the correct alternative:
(c) The rate of change of total momentum of a many-particle system is proportional to the external force/sum of the internal forces on the system.

External force

Internal forces cannot produce any change in the total momentum of a body, irrespective of the direction. Hence, the total momentum of a many- particle system is proportional to the external forces acting on the system. 
207 Views

What are different units of energy?

The different units of energy are :

(i) Joule            
(ii) Erg
(iii) eV            
(iv) KWh
(v) Calorie.

804 Views

What is watt?

SI unit of power is Watt. 
773 Views

Define watt.

Power is said to be one watt if one joule of work is done in one second. 
860 Views

Is work a scalar or a vector quantity?

Work is dot product of two vectors. i.e. F with rightwards arrow on top times S with rightwards arrow on top.

And dot product is a scalar quantity. Therefore, work is a scalar quantity. 
1450 Views

Define the unit joule.

Work done is said to be one joule if one newton of  force displaces the body through a distance of one meter in the direction of applied  force .
799 Views