Herong's Notes on Physics - Version 3.21, by Dr. Herong Yang
Newton's Second Law of Motion
This section introduces Newton's Second Law of Motion - The acceleration of an object is directly proportional to the net force acting on the object, and inversely proportional to the mass of the object.
Newton's Second Law of Motion - The acceleration of an object is directly proportional to the net force acting on the object, and inversely proportional to the mass of the object.
Newton's second law of motion can also be expressed as a formula: F = ma, where F represents the net force, m represents the mass of the object, and a represents the acceleration. The standard units of measure used in this formula are:
F (force): newton m (mass): kilogram (kg) a (acceleration): meter per second per second (m/s/s/)
Can a human pull an airplane to accelerate? Yes, Kevin Fast from Canada was able to pull and accelerate airplane of 188,000kg. If we assume that Kevin Fast can give the airplane a constant net force of 1,000 newtons, the airplane will be accelerated at 0.00532m/s/s constantly.
How far can Kevin pull the airplane after 60 seconds (1 minute)? The answer can be calculated with the following steps:
Initial speed is 0.0m/s Acceleration is 0.00532m/s/s Final speed at 60s time is 0.31915m/s Average speed is 0.159574m/s Distance at 60s time is 9.57447m
So Kevin can pull the airplane for almost 10 meters with 60 seconds!
Actually, Newton's First Law of Motion is a special case of the Second Law of Motion, where F is 0.
Last update: 2014.
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