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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