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They are (listed in order of decreasing strength):(4) gravitational force(2) electromagnetic force(1) strong nuclear force(3) weak nuclear force. The electromagnetic force is a very strong, long-range force with unlimited range that acts between any two objects possessing an electric charge. It is the fundamental interaction that binds electrons to nuclei to form atoms and binds atoms together in molecules and solids.
When an unbalanced force is applied to an object, the object will accelerate. The size of the acceleration depends upon the force applied and the mass of the object. There is a relationship between force, mass and acceleration (force = mass Ã acceleration). Gravity is a force that attracts objects with mass towards each other. The weight of an object is the force on it due to gravity. There is a relationship between weight, mass and acceleration of free-fall (weight = mass Ã acceleration of free-fall). The gravitational field strength of the Earth is 10 N/kg and its acceleration of free-fall is 10 m/s 2.