In this video, we’ll discuss projectile
motion, and by separating out the horizontal and the vertical components
of that motion, we’ll derive the acceleration, the velocity and the
displacement of an object undergoing projectile motion. Projectile motion
occurs when a moving object is subject to a constant gravitational force, and no
other forces are acting on the object. This is the type of motion that
basically any objects traveling through the air will undergo. This is motion we
all intuitively understand, even our furry friends, at least when a treat is
on the line. We know that if we throw an object up into the air, it will rise
continuously to our maximum heights. Then It fall continuously until reaching a
surface or the ground. We know that if we throw the same object at a steeper or
shallower angle from the horizontal, and we want the object to reach the same
location, then we can throw the object at a different speed to affect its motion.
Of course, if I want to reach the greatest height at the same speed, I know
that I need to throw the same object straight upwards. To experience
projectile motion, we also don’t need to throw the object upwards. The objects
still undergoes projectile motion if it’s thrown at an angle below the
horizontal, and if I’m feeling very mean to my diligence assistants, I can even
drop the object onto the ground and we still have the conditions for projectile
motion. The only force acting is gravity. Of course in this and there, most
projectile motion problems will neglect air resistance.
So, when the object leaves my hand, what other forces acting on it? Well, from the
definition of projectile motion, the only force acting on the object is the force
due to gravity.