Acceleration is a measure of how quickly an object's velocity changes over time. It is defined as the rate of change of velocity and is typically measured in meters per second squared (m/s²).
Acceleration is directly proportional to the net force acting on an object. This means that the greater the net force, the greater the acceleration, and vice versa. This relationship is described by Newton's second law of motion: F=ma, where F is the net force, m is the mass of the object, and a is the acceleration.
Positive acceleration occurs when an object's velocity increases, while negative acceleration (also known as deceleration) occurs when an object's velocity decreases. Both types of acceleration are caused by the presence of a net force acting on the object.
Net force is calculated by adding together all of the forces acting on an object. If the forces are acting in the same direction, they are simply added together. If the forces are acting in opposite directions, the net force is the difference between the two forces.
No, an object cannot have acceleration without a net force. According to Newton's first law of motion, an object will remain at rest or in motion with constant velocity unless acted upon by a net force. Therefore, a net force is necessary to cause acceleration in an object.