Forces - forces in the universe

3 important questions on Forces - forces in the universe

What is a foci/focus?

Two points, A and B, that you need in order to draw an ellipse. For all points P on the ellipse, the sum of the distance AP and BP is the same: AP + BP = constant

Why does the planet not move in a straight line?

Because gravity acts perpendicularly to the direction of the motion

What is a centripetal force?

Force pointing towards the centre of a circular or elliptical motion in which the moving object is constantly deviating and traveling in an orbit around the centre

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