* Acceleration: A change in velocity over time. This could be a change in speed, a change in direction, or both.
* Force: A push or pull on an object.
* Net Force: The overall force acting on an object after considering all individual forces and their directions.
Here's the key principle:
* Newton's Second Law of Motion: This law states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.
* In simpler terms: The more force you apply, the more the object accelerates. The heavier the object, the less it accelerates with the same force.
Examples:
* Pushing a cart: The force you apply to the cart causes it to accelerate. The more you push, the faster it goes (greater acceleration).
* A ball falling: Gravity pulls the ball down, creating a net force. This force causes the ball to accelerate downwards.
* Turning a car: You apply force to the steering wheel, which changes the direction of the car's velocity, resulting in acceleration.
Important Note: Even if multiple forces are acting on an object, if they cancel each other out, there's no net force and therefore no acceleration.
