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( group 7) something special about our catapult...

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( group 7) something special about our catapult...

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even though we only used the number of ice-cream sticks that were given and didn't ask for more, we moved the ice-cream sticks (base) closer towards the end of the catapult (end of the spoon) so that the rubber bands would be stretched even more. Hence, it would possess more elastic potential energy (stretched rubber band), which would be converted into more kinetic energy (spoon on ice-cream stick) which would then be converted into more kinetic energy (ping pong ball), allowing the ping pong ball to travel a further distance. :)

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This is our amazing
catapult

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Madison Asia Emma and Priscilla. We used a catapult that was higher and we used more rubber bands to hold the spoon and popsicle stick in place. So there would be  more elastic potential energy and the ball would move further.

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MY GROUPS CATAPULT
we used all the ice cream sticks and we extended the catapult behind the spoon

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We used 10 ice-cream sticks, 5 rubber bands, 1 spoon and a ping-pong ball. we added 1 more rubber band so that there is more elastic potential energy to be converted into more kinetic energy.
Energy conversion:
Elastic potential energy (stretched rubber bands) to kinetic energy (catapult) to kinetic energy (ping-pong ball)

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MY CATAPULT
We used  10 ice-cream sticks and 5 rubber bands to make this catapult. We realised that the spoon was too heavy and weighed down the catapult. So, we added more rubber bands to the front in order for it to possess more Elastic Potential Energy.
We tried our best ;D

Group memebers(1)
Chloe
Yu En
Jana
Lorraine

PS our ping pong ball got kidnaped

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We tightened the rubber band around the plastic spoon and the ice-cream sticks to get the ping pong ball to move further. We used two rubber bands to strap the spoon to the ice-cream stick so it would be more secure and the rubber band will have more elastic potential energy.

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(Group 5)   Evelyn, Phoebe, Anna and Lynn’s catapult
It is very colourful
Our catapult will shoot the ping pong ball extremely high but not that far.

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Members: Elizabeth, Olivia, Suzanne, crystal.
Made using: spoon, Ruler

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Group 4
The base has 8 ice cream sticks. After attaching that, we but a brown ice cream stick between 2nd last and the last stick. After that, we used another rubber band to attach the spoon to the extra ice cream stick, we then used a rubber band and tied it to the brown ice cream stick at the bottom.we also noticed that if we tie the rubber band closer to the end, the ping pong ball possesses more potential energy which will be converted to more kinetic energy of the ball, allowing it to travel a further distance. :)

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Calista, Ariel, Janelle and Naomi
Group 8
We built this catapult with all the sticks and rubber bands

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Made using 8 sticks, 4 rubber bands and a spoon. Added more rubber bands/sticks to make the ball move further.
EPE (rubber band) —> KE (stick) —> KE (pp ball)