Which of the following statements are always correct, according to Newton\'s 2nd

Question

Which of the following statements are always correct, according to Newton's 2nd law? Choose one or more correct answers. For each object, vectors F_net and a have the same direction. If an object is sliding on a horizontal surface, its weight and the normal force acting on it must have the same magnitude. The velocity of an object is directly proportional to the magnitude of the net force acting on the object. The velocity of an object is inversely proportional to the mass of the object. If more than two forces are applied to an object, its speed must be changing. If more than two forces are applied to an object, its velocity must be changing. If exactly two forces are applied to an object, its speed must be changing. If exactly two forces are applied to an object, its velocity must be changing. If exactly one force is applied to an object, its speed must be increasing. If exactly one force is applied to an object, its speed must be decreasing. If exactly one force is applied to an object, its velocity must be changing.

Explanation / Answer

first option is correct as the force applied is always in the direction of acceleration

if the object is sliding , yes the weight will be equal to the normal force

F = ma = mdv/dt

force is directly propoetional to the rate of change of momentum

only (1) and (2) option are correct

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