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In which direction does friction act?
Opposite to the direction of movement.
Why does an moving object no force propelling it always slow down?
Friction
What is drag?
Resistance in a fluid, air resistance is a type of drag.
What factors affect drag?
Drag increases with speed and depends how streamlined it is.
What is terminal velocity?
The maximum velocity an object can reach, it is reached when the force of weight is equal to air resistance.