Primary Science – Energy Conversion Topic

Archery

This science revision note aims to help your child:

– Explain the energy conversion involving elastic potential energy and kinetic energy.

– Remind your child to link the concepts back to the question.

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MUST-KNOW factors affecting elastic potential energy:

– Length of extension/compression of the elastic object. The greater the length of extension/compression of the object, the greater amount of elastic potential energy the object possesses.

Question

In a game of archery, Tom needs to ensure the arrow hits the target. The diagram below shows a bow and an arrow.

When the bow is pulled back and released, the arrow flew towards the target.

Explain why the distance moved by the arrow increases as the bow is stretched further.

STEP 1

Identify the energy conversion and/or transfer starting from when the bow is pulled back to when the arrow hits the target.  Break down each step.

– When the bow is pulled back

– When the bow is released

Remember to state the object that possesses the energy.

Step 2

Take note of the comparative word “further” in the question. Remember to compare your answer by using words like “more” and “greater”.

FINALLY, piecing the answer together using the correct keywords.

Explain why the distance moved by the arrow increases as the bow is stretched further.

Answer

When the bow is pulled further, the bow possesses/has more elastic potential energy. When the bow is released, more elastic potential energy in the bow is converted to more kinetic energy in the arrow, causing the arrow to move a greater distance.

Additional learning material for this topic

Congratulations! You’ve understood the basics of explaining the energy conversion for archery. 

Do read this challenging question on energy conversion >>> https://scienceshifu.com/science-challenging-question-on-energy-conversion/

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