1. Net Force:
* A non-zero net force must act on the object. This means the sum of all forces acting on the object must not cancel out.
* The net force must be in the same direction as the object's motion. A force acting in the opposite direction will cause the object to slow down (decelerate).
2. Mass:
* The object must have mass. A force acting on an object with no mass would result in infinite acceleration, which is not physically possible.
Newton's Second Law of Motion:
These conditions are directly related to Newton's Second Law of Motion, which states:
Force = Mass x Acceleration
* F = ma
This equation means that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.
Examples:
* Pushing a box: When you push a box across the floor, you are applying a force that causes it to accelerate. The more force you apply, the faster the box accelerates.
* Gravity: Gravity pulls objects towards the Earth, causing them to accelerate downwards. The acceleration due to gravity is approximately 9.8 m/s².
* A car accelerating: When you press the gas pedal in a car, the engine applies a force to the wheels, causing the car to accelerate.
Important Note:
* Velocity is a vector quantity: It has both magnitude (speed) and direction. Therefore, an object can have increasing velocity even if its speed remains constant, as long as its direction changes. For example, a car moving in a circle at a constant speed is still accelerating because its direction is constantly changing.
