Our group's catapult ( Michaela, Angela, Cody, and Ricardo) got 2nd place for period 1 !!!!!! This is because we are awesome...Actually it's due to the forces acting upon the catapult. Types of forces include elastic and tension forces. When you pulled down the catapult arm, you applied a tension force that caused the object to exert an elastic force that pulls back in the opposite direction. The size of this elastic force equals the size of the tension force. The other forces applied were balanced and unbalanced forces. The catapult was balanced until an unbalanced force ( a person ) tried to launch a golf  ball by pushing down on the catapult's arm. Also remember that the catapult will act right back at the golf ball with an equal and opposite force. But the golf ball can accelerate because the forces applied to it is unbalanced. Force and mass are proportionate to each other likewise with force and acceleration The bigger the mass the bigger the force applied to the object.  If launched  with a great force, the greater the acceleration. Since the mass is inversely proportional to acceleration, the small golf ball will accelerate at a fast rate. The projectile motion of the ball was launched at a 55 degree angle and fell the same time as the other catapults and accelerates 9.8m/s in the vertical direction.