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when is an object in motion? when it changes position in relation to a reference point what are the 3 types of acceleration? increasing speed, decreasing speed, and changing direction how is force described? by its strength and by the direction in which it acts what are the two factors that affect friction? the types of surfaces involved and how hard the surfaces are pushed together how can you determine the momentum of an object? by multiplying the object's mass by its velocity what can you do to increase the velocity of an object? increase the speed and direction of an object's motion what two factors affect the force of friction? the types of surfaces involved and how hard the surfaces are pushed together what are the factors that affect kinetic energy? speed and mass can mechanical energy be only potential or kinetic? yes what is the law of conservation of energy? energy cannot be created or destroyed what is the interaction between electric charges called? electricity what does it mean that most objects do not have a charge? neutral how does an uncharged object become charged? by gaining or losing electrons how does electric current differ from static electricity? electric current is made up of charges that flow continuously what are the factors that determine resistance? diameter, length, material, and temperature what is the end of a magnet called? a magnetic pole what items would you need in order to demonstrate magnetic force? magnetic and metal objects where are the magnetic forces of a magnet the strongest? near the poles are Earth's magnetic poles in the same place as the geographic poles? no what is the difference between electrical energy and mechanical energy? electrical energy is the energy associated with electric currents. mechanical energy is the energy an object has due to its movement or position.