Question

explain Newton second law​

Answer 1

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Newton's Second Law of Motion describes relation between a cause (external force) and an effect (acceleration).

When a human body accelerates, we know that a non-zero resultant external force must be acting on it.

If a non-zero resultant external force ΣF (the sum of all external forces acting on the body) acts on a human body with the mass m, we know that the body must accelerate.

This fact can be mathematically expressed as:

ΣF=ma

where a is acceleration.

Every time a human body, or any object in sport, decreases its velocity, increases its velocity, or changes the direction of its motion, it moves with non-zero acceleration. Resultant external force is the cause of this acceleration.

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Answer 2

Answer:

The Newton Second Law of motion states that The rate of change of momentum of a body is directly proportional to the applied force and it takes place in the direction in which the force acts.

Let's take an example that if we rotate a stone tied with a string at uniform speed than the magnitude of momentum remains the same but its direction change i. e ., the force is applied by us to rotate the stone and that force causes the change in the direction of motion.

Now, we conclude that force depends on the change in the magnitude or direction of momentum and even the time interval in which the change occurs.

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