The direction of the force is along the straight line joining the two charges. It can either be an attractive force (pulling the charges closer) or a repulsive force (pushing the charges away from each other. To determine if the force is attractive or repulsive, just compare the sign of the two charges: Different sign = attractive force Same sign = repulsive force Complete the table below. Write repulsive/attractive on each cell. q1 + q2 +

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!