What is force in physics?
In physics, force is a push or pull that can change an object's state of motion by causing acceleration, slowing it down, or changing its direction. It is a vector quantity, meaning it has both magnitude and direction, and its SI unit is the newton (N).
What the question is asking
You need a clear physics definition of force, plus the main features that make it correct in exams: what force does, whether it has direction, and how it is measured.
Definition you can learn
A force is a push or pull acting on an object that can change its motion (start moving, stop, speed up, slow down, or change direction) or change its shape.
Key properties that support the definition
- Force is a vector, so you must specify its direction as well as its size.
- Force is linked to acceleration by Newton’s second law:
$$F = ma$$
- The SI unit of force is the newton (N), where
$$1\,\text{N} = 1\,\text{kg}\cdot \text{m}/\text{s}^2$$
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