Projectile will still reach its furthest distance even if the starting point of projectile is not 0 or not in a same level as the surface the projectile landed as long as it is shot in a 45° angle.
Plan.
Equipment.
1 Catapult.
1 Ball.
1 Measuring Tape (to measure the distance traveled by the ball).
Inclinometer Compass App in IPhone (to measure the angle of projectile).
Support (to customize the angle).
Variables.
Independent: .
Angle of the catapult being shot.
Changing the height of the support for the catapult will change the angle of the projectile. The angle will then be measured using the inclinometer app.
Dependent: .
Distance of the first bounce of the ball.
The distance will be measured by spotting the first bounce where the ball lands.
Controlled: .
Type/weight/shape of ball being used.
The type of ball being used is not going to be changed. Every projectile will have the same ball as the object to be thrown. This way, the object being thrown will remain controlled.
Power of the catapult (how far the rubber band is pulled).
Pulling the rubber band to the same distance every time will control the power of the catapult.
Diagram of Projectile.
The diagram is showing how catapult is being setup and ball is projected with measuring tape under the projectile's path. The angle changed by changing the height of the support under the catapult. Measuring tape is being set up in the direction and path of the projectile.
Procedure.
1. Setup the catapult.
2. Prepare the measuring tape. .
The measuring tape should be straight and make sure no obstacle causes the tape curl or bend. The 0 on the tape should be right in front of the catapult.
3. Set the angle to 0° by changing the height of the support. .
4. Use the Inclinometer Compass App in IPhone to make sure the catapult is on 0°.
5. Put the ball on the catapult. .
6. Pull the elastic band and then let go of it.
7. Measure the distance of the first bounce of the ball.
8. Repeat for 5x in order to get and accurate result.
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