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Thursday, 22 June 2017

Week 8

This week we have been working on the trebuchet and onager. The difference with the trebuchet is it can fly further than the onager because they have different forces. The trebuchet arm flings the tennis ball higher than the ball on the Onager.

The onager is powered by string which is twisted tight to make it fire.  This is called torsion. The trebuchet is powered by gravity, which pulling the bucket of weights down, called a counterweight, which makes the throwing arm fling up and fire the tennis ball.

The trebuchet goes slowly at the start but then it will go fast at the end.
But with the onager the arm goes fast all the time.

2 comments:

  1. Hi Thomas, I enjoyed your piece of scientific writing. It hooked me at the start because I wanted to know more about a trebuchet and an onager and their differences. Based on your writing, I googled 'onager' to find out about more about this catapult. your writing explained some of the differences to me. I was also inspired by the little catapult you brought home from school last week and I enjoyed having a few turns with it. I was surprised by how far it went across our lounge. It flew far and fast. I also wanted to be a member of He Tangata last week when your class was experimenting on the field, It looked fun. I wonder what you observed and how you might incorporate those learnings into this week? I am keen to know about your group's ideas for this week and your end results. Have fun. Thanks, Anna (mum!)

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  2. Hi Thomas, I enjoyed your piece of scientific writing. It hooked me at the start because I wanted to know more about a trebuchet and an onager and their differences. Based on your writing, I googled 'onager' to find out more about this catapult. Your writing explained some of the differences to me. I was also inspired by 2 things last week - (1) the little catapult you brought home from school. I enjoyed having a few turns in our lounge. It went far and fast! (2) the fun your class was having while experimenting on the field. I observed you cheering your classmates and I so wanted to be a member of He Tangata.

    I wonder what specific observations you made last week and how you might incorporate those learnings into this week as you make your own launcher. I am keen to know about your group's ideas and your end result. Thanks, Anna (mum!)

    ReplyDelete