Balanced and Unbalanced Forces Notes What is a force? A _______________________ is a push or a pull that acts on an object - units are in Newtons (N) - forces can make an object move or change direction - forces can act in 2 ways o through direct contact ! ________________________ involve direct contact with an object ! ________________________ is a force that opposed the motion between two surfaces that are in contact • you need more force to overcome friction to get the object moving o at a distance ! __________________ is the universal attraction that exists between all objects • pulls towards center of the Earth • the pull gives the object its _______________ (a measure of the amount of gravity acting on an object) ! ____________________ What is net force? ____________________ is the combination of all the forces acting on the object - can be o ________________________ - a set of forces that cancel each other so that there is no overall force on an object ! act in opposite directions ! motion of the object doesn’t change o ________________________ - set of forces acting on an object that do not cancel each other out ! motion of the object changes ! can make an object • start moving • speed up • slow down • change direction