DBS 10012
ENGINEERING SCIENCE
LECTURER NAME:
NOORHARINIE BINTI RAHIMIN
CATALPULT
MUHAMMAD SHAHARIMAN BIN SHAHADAN 13DAD23F1046
MUHAMMAD IDDIN HAFIDZ BIN MUSTAFA 13DAD23F1023
MUHAMMAD AFIQ AIMAN BIN MOHD AZLAN 13DAD23F1033
MUHAMMAD HARITH MIFZHAL BIN MOHD AFIZAN 13DAD23F1038
DESCRIPTION
A catapult is a type of ballistic device used to launch a projectile a great distance without the
use of explosives. It uses the mechanical advantage of a lever system, typically powered by
tension such as a spring or by a twisted rope or cord, to propel the projectile. The projectile
can be a rock, a spear, a ball, or something else. The catapult works by storing energy in the
tension device and then releasing it suddenly, allowing the projectile to be launched at high
speed.
There are different types of catapults, including the ballista, the trebuchet, the mangonel,
and the onager. These different designs use various mechanisms to generate the force
required to launch the projectile.
Catapults have been used for thousands of years and were a key military weapon in ancient
and medieval warfare. They were used to launch projectiles at enemy fortifications, troops,
and ships. Catapults were also used in siege warfare to breach walls and to create panic
and confusion among enemy forces.
In addition to their military use, catapults have also been used for non-military purposes,
such as launching objects in festivals and celebrations, or for entertainment in reenactments
of historical events.
Overall, the catapult is an ingenious invention that has played a significant role in human
history, both as a weapon of war and as a symbol of human ingenuity and engineering
prowess.
OBJECTIVE
Understand and analyze the power of a catapult.
Understanding the inner mechanism of the catapult.
Creating a miniature model of a working catapult.
Calculate the kinetic energy between the catapult and the projectile.
PROCEDURE
1.Place several popsicle sticks side by side to make a lactic site and place two extra ice
cream rods perpendicular to the ends to strengthen the base structure.
2. Build another V-shaped site to be placed with the main site to further strengthen the lactic.
3.Place a popsicle sticks on the back of the V sole and keep it in the middle to support the
traction.
4. Build two V-shaped poles and then erect on the right and left sides.
5. Take two popsicle sticks and then apply to the front of the poles that have been erected.
Make sure one is on top and the other is in the middle of the pole.
6. Build one lactic arm and place the lid of the bottle at the top of the arm to hold the Ping
Pong ball.
7.Place the lactic arm on the prepared side.
8.Place the rubber band on the lower end of the lactic arm and pull until tense to the
prepared popsicle stick on the back of the catapult.
9.Test the catapult.
DIAGRAM
BOTTLE CAP
Holding the projectile.
RUBBER BAND
Creating tension to propel the
projectile.
POPSICLE STICKS
Used for the main structure for
catapult.
MATERIAL AND COST
BIL MATERIAL QUANTITY COST (RM)
1. Popsicle sticks 55 5.10
2. Bottle cap 1 Free
3. Rubber band 5 Free
TOTAL 61 5.10
DISCUSSION AND RESULT
1.The distance the Ping Pong ball is thrown.
Estimate 1 = 1 meter
Estimate 2 = 1.5 meter
2.Important aspect for catapult.
1. Balance
2. Harmony
3. Simplicity
4. Traction strength
RESULT
Ping Pong ball Mass = 155.94 gram 2.6 / 0.81 = 3.21 m/s
Time = 0.81 second
Distance = 2.6 meter
Kinetic Energy = 0.5(0.15594) (3.21 ^2)
=0.803 J
CONCLUSION
In conclusion, this project is an overall success. In this project, we have learned the
history and mechanism that went in to creating a catapult. In addition, we have successfully
created a working model of our own catapult. We have also learned to calculate the
distance, time, and kinetic energy that acted on the projectile.
