18. What is Second law of motion? Derive the equation of Force.
19.What is Law of conservation of momentum? Derive the Equation.
20.State which of the following situations are possible and give an example for each of these:
(a) An object with a constant acceleration but with zero velocity
(b) An object moving with acceleration but with uniform speed.
(c) An object moving in a certain direction with acceleration in the perpendicular direction.
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Newton's second law of motion can be formally stated as follows: The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.The formula for force says force is equal to mass (m) multiplied by acceleration (a). If you have any two of the three variables, you can solve for the third. Force is measured in Newtons (N), mass in kilograms (kg), and acceleration in meters per second squared ( m/s2 ).
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