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Qtr 2 Wk 3 Forces

Qtr. 2, Wk. 3: Forces

TermDefinition
Force a push or pull exerted on an object; a force is described by its strength and its direction; F = m x a
Newton the SI unit for force; lifting a lemon requires about 1 newton of force
Net Force the combination of all forces acting on an object; determines whether or not the object will move and also the direction of movement
Unbalanced Forces forces that produce a nonzero net force, causing an object to move, stop moving, or change direction
Balanced Forces equal forces acting on an object in opposite directions; results in 0 net force and no change in motion
Friction the motion-opposing force exerted by surfaces when objects are in contact with each other; factors include surface conditions and the objects' weights
Gravity the force that pulls objects toward each other; factors include the objects' masses and distance apart
Mass the SI measure for how much matter is in an object; measured in kilograms or grams
Newton's First Law of Motion An object will remain at rest or in uniform motion in a straight line unless acted upon by an external force; aka 'Law of Inertia'
Inertia the tendency of an object to resist any change in motion; is dependent upon the object's mass
Newton's Second Law of Motion The acceleration of an object depends on the object's mass and on the net force acting on the object; aka 'Law of Acceleration'
Newton's Third Law of Motion If an object exerts a force on another object, the second object exerts a force of equal strength in the opposite direction on the first object; aka 'Action/Reaction Law'
Momentum a characteristic of any moving object equal to the product of the object's mass and velocity (kg x m/s)
Created by: Rita.Rogers