Newton’s Second Law

Newton’s Second Law

Newton’s second law of motion is more qualitative and widely used to compute what happens in situation linking forces. The second law of motion states that acceleration is created when an unbalanced force acts on an object (mass). The more the mass of the object the more net force has to be applied to move it i.e. the rate of change of momentum is directly proportional to the unbalanced force applied in the direction of the force. This law is only valid for constant mass systems.


F = dp/dt = d (mv)/dt
F = m (dv/dt) = ma
F = ma is a simple equation of the second law of motion concerning force, mass, and acceleration.


Example “ If the person uses the same force to push a truck and push a car, the car will have more acceleration than the truck, because the truck has more mass and the car has less mass. As the force acting on the object is increased, the acceleration of the object is increased and as the mass of an object is increased the acceleration ob object is decreased.
Another example is to push an empty lorry is much easier than to push a full one, because a full lorry has more mass and it requires more force to push the full lorry.
Hitting a ball, pushing and pulling the door, designing racer bike/car to increase their speed by reducing their mass are some other examples of the law of motion.

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