A 5.3 kg block rests on a level surface. The coefficient of static friction is μs=0.67, and the coefficient of kinetic friction is μk= 0.48 A horizontal force, F, is applied to the block. As (F)is increased, the block begins moving. Describe how the force of friction changes as (F)increases from the moment the block is at rest to when it begins moving. Show how you determined the force of friction at each of these times ― before the block starts moving, at the point it starts moving, and after it is moving. Show your work.

1. Current flows through the battery, aluminum foil, and paper clips, and into the wire coil, creating an electromagnet. One face of the coil becomes a north pole; the other a south pole. The permanent magnet attracts its opposite pole on the coil and repels its like pole, causing the coil to spin.

2. The direction of an electric current is by convention the direction in which a positive charge would move. Thus, the current in the external circuit is directed away from the positive terminal and toward the negative terminal of the battery. Electrons would actually move through the wires in the opposite direction.

Explanation:

b.

explanation:

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