A projectile is an object that is thrown or launched into the air and is subject only to the force of gravity and air resistance (if present). Once launched, a projectile follows a curved path known as a trajectory under the influence of these forces. The key characteristics of projectile motion are that the object has an initial velocity and then moves freely under gravity, without any additional propulsion or force acting in the horizontal direction.

Some common examples of projectile motion include:

1. Thrown Ball: When you throw a ball into the air, it becomes a projectile. The initial velocity you give it determines the shape and range of its trajectory.

2. Basketball Shot: When a basketball player shoots the ball into the hoop, it follows a projectile motion path. The player's aim, the angle at which the ball is released, and the initial velocity all affect whether the shot goes in.

3. Projectiles in Sports: Various sports involve projectile motion, such as golf, soccer (kicking the ball into the goal), baseball (hitting a pitch), and archery (shooting an arrow). In each of these cases, the object is projected and follows a curved path.

4. Fireworks: Fireworks are a classic example of projectiles. The fireworks are launched into the sky, and they explode at different heights, creating various patterns and colors.

5. Artillery Shell: In military applications, artillery shells are projectiles fired from cannons or artillery pieces. The angle and velocity at which the shell is fired determine its trajectory and where it will land.