Newton's second law of motion states that $F = ma$, where $F$ is the net force on some object with mass $m$ and acceleration $a$. This implies that an object with net force $F$ acting on it, may have two individual forces in opposite directions on it, $F_A$ and $F_B$, respectively, such that thei...

In this video potassium is dropped into the bucket and it reacts with the water present in the bucket causing an explosion inside the bucket itself. I don't see how an internal explosion makes the bucket launch up vertically in the air. If anything it should press harder on the ground.

I have been always taught that Work done = force x distance through which the force was applied. but recently in the elasticity I have been taught that W= (1/2) (F X D). why did we multiply it by a half?, I know that work is the area under the curve and the curve is right-angled triangle like, bu...