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1- What is the subjunctive? 

It is a mood (not a tense!) which expresses uncertain ideas.

2- So when do I use it? 

Set phrases with 'que' 

Negati...

A pendulum bob will move fastest when the mass is at its lowest point (when x=0). The reason for this is that in the pendulum system energy is transferred between kinetic and gravitational potential en...

The centripetal force can be thought of as the force that causes circular motion.

When an object moves in a circle a force must always act on it, even when it moves at a constant speed. T...

The phrase "closed book exam" is enough to make even the most seasoned English Literature student shudder slightly. It's a concept that can set students into a complete panic, keeping them up...

Simple harmonic motion describes the motion of an object which has an acceleration that is directly proportional to its displacement from the equilibrium point and when the accelerations acts in the oppos...