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 Feb 4 awarded Nice Answer Dec 5 awarded Popular Question Sep 14 awarded Popular Question Mar 5 revised Zero velocity, zero acceleration? spelling rectified Mar 5 suggested approved edit on Zero velocity, zero acceleration? Mar 5 comment Meaning the symbol, $W$ and $dW$ $dW$ represents the infinitesimally small change in $W$, i.e, $W_2-W_1=dW$ where $W_1$ and $W_2$ are work done between infinitesimally small period. Feb 24 comment Earth's magnetic field and the equator Magnetic force experienced by the charged particle is always perpendicular to the component of Magnetic field and velocity. Jan 26 comment Why don't fluorescent lights produce shadows? At first I didn't even needed to read the answer, it was the animation that explained everything. Great answer! Jan 16 comment Rolling without slipping and friction I recommend you to modify your question again since it's quite deviating. Jan 16 comment Rolling without slipping and friction Exactly! Ball will be needing a torque to do rotational motion. Any guesses from where will it come from? Its obviously the "frictional force" that will offer the torque to the ball which will further lead to the completion of circular motion. Jan 16 comment Rolling without slipping and friction Question need some serious corrections because I am not able to conclude that what you really want to ask? But here is something for you. Friction being "a necessary evil" is important to exist for the relative motion between two surfaces. If there is no friction the ball will keep on slipping and there will be no relative motion. Dec 10 awarded Excavator Nov 15 awarded Benefactor Nov 15 accepted How any material can provide electrostatic and magnetic shielding Nov 13 revised How any material can provide electrostatic and magnetic shielding Mathjax brushed up Nov 13 comment How any material can provide electrostatic and magnetic shielding +1 for electromagnetic shielding. Thanks Nov 13 suggested approved edit on How any material can provide electrostatic and magnetic shielding Nov 9 awarded Tag Editor Nov 9 revised bosons wiki description added 231 characters in body Nov 9 suggested rejected edit on blackbody tag wiki excerpt