Force, A push or a pull., Gravity, A force that pulls objects toward the Earth., Mass, How much matter an object has; more mass means stronger gravity., Balanced Forces, Two equal forces pushing or pulling in opposite directions that cause no movement., Unbalanced Forces, Two unequal forces pushing or pulling in opposite directions that cause movement., Motion, A change in an object’s position or speed, Position, Where an object is located, Friction, A force that resists motion between two surfaces sliding against each other, Simple Machine, A tool that reduces the amount of force needed to do work, Inclined Plane, A ramp that connects a lower level to a higher level., Wedge, A triangular-shaped object used to hold objects in place or cut them., Wheel and Axle, A wheel that rotates around a rod to help move objects., Lever, A stiff bar supported by a fulcrum that lifts or moves a load., Fulcrum, The point that a lever rests on and pivots around., Screw, An inclined plane wrapped around a rod, used to hold things together or lift objects., Pulley, A rope and wheel system used to lift, lower, or move a load.

Force, Motion, & Simple Machine

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