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







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