What is the principle of projectile motion?

The principle of projectile motion states that an object in motion will follow a parabolic path.

When an object is launched into the air, it experiences two types of motion: horizontal and vertical. The horizontal motion is constant and is not affected by gravity, while the vertical motion is affected by gravity and is accelerated downwards at a rate of 9.8 m/s². The combination of these two motions results in a parabolic trajectory.

To fully grasp how displacement and distance contribute to projectile motion, you can refer to the explanation on distance and displacement.

Understanding how velocity changes over time is crucial for analysing projectile motion. Learn more about the area under velocity-time graphs.

Acceleration, especially due to gravity, plays a pivotal role in shaping the parabolic trajectory of projectile motion. For a deeper understanding of acceleration, see here.


The trajectory of a projectile can be described using various equations, including the range equation, which calculates the horizontal distance travelled by the projectile, and the maximum height equation, which calculates the maximum height reached by the projectile.

While focusing on projectile motion, it's also beneficial to explore related dynamics, such as simple harmonic motion (SHM), to understand other motion patterns in physics.


The principle of projectile motion is important in many fields, including sports, engineering, and physics. In sports such as basketball and football, players use the principle of projectile motion to accurately throw or kick the ball towards a target. In engineering, the principle is used to design and test the trajectory of rockets and missiles. In physics, the principle is used to study the motion of objects in free fall and to understand the effects of air resistance on projectile motion.

Overall, the principle of projectile motion is a fundamental concept in physics that helps us understand the motion of objects in the air and the factors that affect their trajectory.

Study and Practice for Free

Trusted by 100,000+ Students Worldwide

Achieve Top Grades in your Exams with our Free Resources.

Practice Questions, Study Notes, and Past Exam Papers for all Subjects!

Need help from an expert?

4.93/5 based on525 reviews

The world’s top online tutoring provider trusted by students, parents, and schools globally.

Related Physics a-level Answers

    Read All Answers
    Loading...