* Force: A force is a push or pull that can cause an object to accelerate (change its velocity).
* Net Force: The net force is the vector sum of all forces acting on an object. This means it takes into account both the magnitude and direction of each individual force.
Key Concepts:
* Newton's First Law: An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
* Newton's Second Law: The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. (F = ma)
In summary: If the net force acting on an object is not zero, the object will experience a change in velocity.
