Question 1

What is a Newton (N)?

Accepted Answer

A Newton is the SI unit of force. 1 N is the force needed to accelerate a 1 kg mass at 1 m/s². It’s roughly the weight of a small apple.

Question 2

How does F = ma relate to weight?

Accepted Answer

Weight is a special case of F = ma, where a = g (gravitational acceleration, 9.8 m/s²). So Weight = mg.

Newton’s Second Law

物理