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Which Newton laws of motion are valid on projectile motion?
How do these laws apply specifically to projectile motion?
In projectile motion, the object or projectile is moving horizontally with a constant velocity while also being accelerated by gravity in a downward direction. The first law applies because the projectile will continue moving in a straight line unless acted upon by a force, such as gravity or air resistance. The second law applies because the force of gravity acting on the projectile is equal to its mass multiplied by its acceleration due to gravity. And the third law applies because the projectile exerts an equal and opposite force on the Earth, which is why the Earth is pulled slightly towards the projectile as the projectile moves through the air.