Physics for IGCSE & O level - Forces And Motion (Section 7 - No. 4)
Which statement best describes Newton's First Law of Motion?
Force equals mass times acceleration.
For every action, there is an equal and opposite reaction.
An object at rest stays at rest and an object in motion stays in motion with the same speed and direction unless acted upon by a force.
The acceleration of an object is inversely proportional to its mass.
คำอธิบาย
Newton's First Law is about inertia.