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Science and Catapults: What a Wonderful Friendship

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Kaitlyn Frawley

on 7 December 2012

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Transcript of Science and Catapults: What a Wonderful Friendship

Science and Catapults
How do catapults connect to science? This shows the catapults projectile motion! Quite simply a catapult connects with motion.
Because a catapult has something in motion it relates to velocity, average speed, and acceleration. Velocity- the object the catapult launches has both a sped and a direction Average Speed- it is very very possible to find the average speed of the object as long as you know the distance traveled and the time it took to travel that distance Acceleration- the object doesn't get faster (after launch) horizontally but it does accelerate vertically It also applies to projectile motion. When the catapult launches the object at an angle the ball moves both horizontally and vertically. Horizontally the ball only moves forward, it doesn't accelerate. Vertically the object falls because of gravity while accelerating towards the ground. Newton's First Law relates to the catapult. The arm of the catapult is pulled back and let go, this causes a change in motion, which makes the projectile move. Specifically tension and elastic force put the object into motion when the arm is released, by causing an unbalanced force. Newton's Third Law also applies When the arm hits the bar, that sets the angle, the force, that makes the arm move, is applied to both arm and bar. The arm moves back and the bar would be pushed forward but the forces holding it in place are greater than the first force. However, this could still be seen if the bar weakens, then it would also move forward. Newton's Second Law can be seen in the catapult Because of the fact stated in Newton's third law, the force applied to the ball should also be applied to the catapult accept in an opposite direction. But the ball accelerates a lot more than the catapult does, this is because mass is inversely proportional to acceleration. This is also why the catapult hardly moves at all, because its mass is larger. It also connects to Newton's Law of Gravitation Even though everything could connect to Newton's law of Gravitation, the catapult does because the individual parts of the catapult will have a gravitational pull towards each other (in sets of two) as well as the parts and the ground and the catapult and its parts and ground.
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