Newton's Second Law

Newton's Second Law of Motion states that the force acting on an object is equal to the mass of the object multiplied by its acceleration.

Where:

• F = Force (in Newtons or pound-force)
• m = Mass (in kilograms or pounds)
• a = Acceleration (in m/s² or ft/s²)

Units of Force

• Newton (N): The SI unit of force. One Newton is the force needed to accelerate 1 kg of mass at 1 m/s².
• Pound-force (lbf): The imperial unit of force. One pound-force is the force needed to accelerate 1 pound of mass at 32.174 ft/s².
• Conversion: 1 N = 0.224809 lbf
• Conversion: 1 lbf = 4.44822 N

Metric to Imperial

• 1 kg = 2.20462 lb
• 1 m/s² = 3.28084 ft/s²
• 1 N = 0.224809 lbf

Imperial to Metric

• 1 lb = 0.453592 kg
• 1 ft/s² = 0.3048 m/s²
• 1 lbf = 4.44822 N