Why is the First Law of Motion just a special case of the Second Law?

Question

I don't even know what the First Law of Motion is..
Is it the same as the First Newton's Law?

Answer 1

Yes. First law defines inertia, namely inability of a mass to change its state whether at rest or in uniform motion unless acted upon by an external force. The measure of inertia is the mass of the body. That is the first law.
As per the second law force=mass* acceleration,which takes place in the direction of force. Imagine a trivial case when force is zero. The acceleration has to be zero since the mass is never zero. In other words first law is a trivial case of second law when applied force is zero.

Answer 2

Hmm..i learned that the First Law of Motion says that when there is no resultant force acting on an object with constant mass, the object is either stationary OR travelling at constant speed.

The Second Law states that when a resultant force is applied on a stationary object of constant mass, the object moves in the direction of the resultant force in a straight line.



DID YOU KNOW?
With Newton's discovery of the 3 laws of motion and Fleming, electricity, physicists thought they could almost explain the entire universe, until quantum came along, which caused a revolution in science.

Answer 3

the first law of motion is inertia.

An object will stay at rest or move at a constant velocity (constant speed in a straight line) unless acted upon by an unbalanced force.

the second law is

The rate of change of the momentum of a body is directly proportional to the net force acting on it, and the direction of the change in momentum takes place in the direction of the net force.

Answer 4

I've never heard that said before, but I see that it is true.

If F=0 in F=ma, then a is zero. If there is no acceleration, a resting body will remain at rest, a moving body will continue moving in a straight line.

Answer 5

As mr. Newton