* Force: A push or pull that can change an object's motion.
* Net Force: The overall force acting on an object. This is the sum of all individual forces, considering their directions.
Here's how it works:
* Balanced Forces: If the forces acting on an object are balanced (equal in magnitude and opposite in direction), the net force is zero. This means the object will remain at rest or continue moving at a constant velocity.
* Unbalanced Forces: If the forces acting on an object are unbalanced (the net force is not zero), the object will accelerate. This means it will either start moving from rest, change its speed, or change its direction.
Examples:
* Pushing a box: If you push a box with enough force to overcome friction, it will start moving. This is because the net force (your push minus friction) is not zero.
* A car accelerating: The engine creates a force that propels the car forward. Since this force is greater than the forces resisting its motion (friction, air resistance), the car accelerates.
Key Point: Motion doesn't necessarily mean an object is moving. It can also mean a change in an object's velocity. Velocity includes both speed and direction, so a change in direction is also considered motion.
