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Transcript

Newton’s Second Law Review • From our introduction we learned that forces are a push or pull in a particular direction. – Therefore velocity is affected – Therefore acceleration is affected • Forces can be calculated and this is accomplished with Newton’s Second Law. Newton’s Second Law • The acceleration of an object is directly proportional to the net force acting on the object, is in the direction of the net force, and is inversely proportional to the mass of the object. • a = F/m • This can be rearranged to solve for forces. Yay! • Despite the fact that this equation is almost 500 years old, it is still one of the most powerful equations we know. • A force is a push or a pull. It may be gravitational, electrical/magnetic, nuclear or simple muscular effort. How do we use it? • In honor of the man who codified it, the units for forces are Newtons. • What is a newton? • F = ma – Mass units are kg – Acceleration units are m/s2 – Therefore Newtons are equivilent to (kg · m)/s2 Forces are Vectors Circle the right answer 1. The forces shown above are pushing/pulling forces. 2. The forces shown above are working together/opposite forces. 3. The forces are equal/not equal. 4. The forces do/do not balance each other out. 5. The resulting force is 1000 N to the left/1000 N to the right/ Zero N.