Forces... Can exist alone
Only exist alone if there is no acceleration
Can exist alone or in pairs
Always occur in pairs

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The most important difference between a wedge and an inclined plane is a. their size b. their shape c. how they are used d. what they are made of

Which statement correctly describes a step-up transformer? a. it increases the amount of electric energy available. b. it increases the voltage of an electric current. c. it changes direct current into alternating current. d. it has more loops of wire in its primary coil.