When a book slides along a tabletop, the force of friction does negative work on it. Can friction ever do positive work? Explain. (Hint: Think of a box in the back of an accelerating truck.)
Name _________________________________ Period _____ Coulomb's Law Practice Problems 1. Suppose that two point charges, each with a charge of +1 Coulomb are separated by a distance of 1 meter. (a) Will they attract or repel _______________(b) Determine the magnitude of the electrical force between them. 9 x 10 N 2. Two balloons are charged with an identical quantity and type of charge: -0.0025 C. They are held apart at a separation distance of 8 m. Determine the magnitude of the electrical force of repulsion between them. 878.9 N 3. Two charged boxes are 4 meters apart
