Projectiles and satellites move in curved paths due to the effects of gravitational force. By considering motion in horizontal and vertical directions, we can predict their path.
Imagine throwing a ball to someone. As the ball travels horizontally through the air, it also travels vertically because of the effects of the forceA push or a pull. The unit of force is the newton (N). of gravity. Any object moving in this way is called a projectile – an object moving under the influence of gravity.
The force of gravity produces the same downward accelerationThe rate of change in speed (or velocity) is measured in metres per second squared. Acceleration = change of velocity ÷ time taken. on all objects.
Any massThe amount of matter an object contains. Mass is measured in kilograms (kg) or grams (g). (a \(1 kg\) mass or a \(10 kg\)) will accelerate downwards at \(9\cdot 8 ms^{-2}\).
Some projectiles only move vertically. Other projectiles move horizontally and vertically at the same time. When we investigate the motion of a projectile, the horizontal and verticalAt right angles to the ground or horizontal. motion of the projectile are kept separate.