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This video explains the angles of elevation and depression.

Applying Newton's first law to answer some true/false statements about why objects move (or not).

Figuring out the acceleration of ice down a plane made of ice.

An elaboration on how to use Newton's second law when dealing with multiple forces, forces in two dimensions, and diagonal forces.

Basic primer on Newton's First Law of motion.

Newton's second law of motion is F = ma, or force is equal to mass times acceleration. Learn how to use the formula to calculate acceleration.