mass - how big something is, resistive force - a force whose direction is opposite to the object moving, static friction - a force when you try to move something but it stays still, kinetic friction - a force that slows down a moving object, air resistance - when air slows down a moving object, water resistance - when water slows down a moving object, electrostatic force - a non-contact force when things move without being touched, gravitational force - a force that pulls objects to the ground, magnetic force - a non-contact force when a magnet is used to move an object , rough surface - a bumpy surface that causes friction, smooth surface - a surface without any bumps that causes no friction,

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