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Note this is Newton’s first law about motion, an object in motion will stay in motion. Now if gravity is involved with the cannon being fired then the force of gravity would cause the cannon to start to slow down, wouldn’t go as far and the direction or trajectory of the cannon ball would be a curved line going down. Purpose: The purpose of this lab is to give the student a better understanding about projectile motion and to understand Newton’s theories and laws of motion. We will be firing the plastic ball from the projectile launcher three times from eight efferent angles from the ground ; a stool.

With this experiment we will see if shooting from the ground gets the plastic ball to travel farther from the ground or from a higher elevation, the stool. Hypothesis: My prediction, being a well educated guess, I think shooting from the stool the plastic ball will be able to travel farther. I never really considered gravity as a factor on the trajectory of the ball because I only thought about the weight of the plastic ball and the force and speed of how fast the plastic ball is being fired out of the projectile launcher. Then keeping in mind the angle of the plastic ball being fired, the ball will travel farther around a 30-50 degree angle.

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From those angles and the plastic ball being fired from a high elevation, the plastic ball would travel a little farther than being fired from the ground. Equipment Needed: * Projectile Launcher ; Plastic Ball * Measuring Tape or Meter Stick * Graph/Lined Paper * Box to make elevation as muzzle * Plumb bob Procedure: 1) Place the projectile launcher from ground and turn the knob, on the side, this will allow you to get your angle. Match the string on the side with the protractor, this will tell you what angle the plastic ball will be fired from.

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