What is frictional force, Physics

The substances which acquire charges on rubbing are said to be charged. The electricity produced by friction is called Frictional force.  If the charges do not move, then the frictional electricity is known as Static electricity.

MCQs based on the above Concept:

1.    The force produced due to the static charges is called

a)    Dynamic current     b) Current   C) Static Current  

d) None of these

The correct answer is b) Current

i)                  This is because only if the charges are moving it can be a dynamic current

ii)               If the charges are not moving it is static current.

iii)  But if it is moving or not, it still exerts some force, which is called as current.

2.    When the amber is rubbed with fur, it absorbs bits of papers. This was invented by

a)    Amber      b) Thales    c)William Gilbert    d) Benjamin Franklin

The correct answer is b) Thales

1.    Amber is a material.

2.    William Gilbert later found that glass and ebonite possess tha attracting property when it is rubbed.

3.    Benjamin Franklin classified these charges as positive and negative charges

Posted Date: 7/23/2012 4:05:20 AM | Location : United States







Related Discussions:- What is frictional force, Assignment Help, Ask Question on What is frictional force, Get Answer, Expert's Help, What is frictional force Discussions

Write discussion on What is frictional force
Your posts are moderated
Related Questions
Lenz's law (H.F. Lenz; 1835): An induced electric current always pass in such direction that it opposes the change generating it.

Explain internal or external forces Forces can be internal or external. For instance the mutual attraction of atoms within a block of wood are known as internal forces. Somethi

Force: Force may be defined as a push or a pull upon an object.  In the English system the pound (1b) is used to express the value of a force.  For example, we say that a force

A spider is hanging by means of its own silk thread directly above a transparent fixed sphere of r = 20cm .... the refractive index of material of sphere is root(2).... and height

The area element that seems in the integral is a vector. Area like an amount of coverage would appear to be a scalar quantity. What is the way of the area element ?   Ans

When does the Total mechanical energy remain constant?


Electromotive Force: (emf) A force which derives the electric current is known as electromotive force. OR The energy needed to drive the charge around the circuit is know


Q. What is an intrinsic semiconductor? Give any two examples. A) A semiconductor which is pure as well as contains no impurity is known as an intrinsic semiconductor. B) In