Acceleration can be positive or negative. Positive acceleration means that the object is speeding up, while negative acceleration means that the object is slowing down.
The acceleration of an object is determined by two factors: the net force acting on the object and the object's mass. The net force is the vector sum of all the forces acting on the object. The object's mass is a measure of its inertia, or resistance to changes in motion.
According to Newton's second law of motion, the acceleration of an object is directly proportional to the net force acting on the object and inversely proportional to the object's mass. This can be expressed mathematically as follows:
```
a = F/m
```
where:
* a is acceleration
* F is net force
* m is mass
Acceleration is a fundamental concept in physics and has many applications. For example, acceleration is used to calculate the motion of planets, cars, and airplanes. It is also used to design roller coasters, parachutes, and other amusement park rides.
