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

Inertia on a bicycle Get your bicycle going and then apply the brakes rapidly. View the tendency of your body to stay in motion and pitch you over the handlebars. This is the r

For germanium the forbidden gap is (A) 0.15ev. (B) 0.25ev. (C) 0.5ev. (D) 0.7ev. Ans: For germanium the forbidden gap is 0.7ev.

a) Two long wires, carrying currents i 1 and i 2 , are placed perpendicular to each other in such a way that they just avoid to contact. Determine the magnetic force on a small le

Power: The rate of doing work is called power, and it is defined as the work done in unit time.  As a formula, this would be: power = work done/time Taken  Power is exp

Refraction of Light: When a ray of light in single medium meets the surface of second medium, a part of the ray enters in the second medium; this phenomenon is called as refrac

Landauer's principle: A principle that states it doesn't take energy to compute data explicitly, but rather it takes energy to erase any data, as erasure is a significant step

The cantilevered beam below is supported at O.  F1 and F2 in kN are given in P21 and P22 respectively and act on the beam as shown.  Determine the magnitude and direction of a sing


Explain, with the help of a circuit diagram, how the thickness of depletion layer in a p-n junction diode alters when it is forward biased. In the following circuits which one of t