Newtons second law, F=ma, Newtons third law , for every action force there is a reaction force, units for acceleration , ms-2, units for Force , N, acceleration , rate of change of speed, size of gravitational field on Earth, 10 (9.8) Nkg-1, Weight, effect of gravity on a mass and measured in Newtons , mass , amount of matter an object is made of and measured in kg, size of net force when forces are balanced , zero, effect of an unblaanced force on an object, the oject will change its speed (accelerate) if forces are unbalanced , equation for weight force, F=mg ( or F=ma), an object travelling at a constant speed , all forces are balanced , terminal velocity, maximum speed reached where air resistance is equal to weight force  , thrust, driving force /applied force, examples of non contact forces definition of a force , electrical gravitational magnetic, Newtons first law , an object at rest stays at rest and object in motion stays at a constant speed and direction unless an unbalanced force acts upon it, tension , pull force eg from a rope , net force , overall or resultant force acting on an object.

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