Body Machine Writing Worksheet
Grade 3 Science • Writing Practice
Body Machine Writing Worksheet
How body systems work together like an amazing machine!
Name:
Date:
Key Concept: A system is a team of different parts that work together to do an important job. If one part stops working, the whole team has to work harder!
1
What is a system?
Explain what a system is in your own words. Give an example of a system you see every day (like a bicycle, a school, or a clock).
Sentence Starter: A system is a group of parts that work together to...
2
How do different systems interact?
Systems are teammates! Explain how two systems help each other (for example, how bones and muscles work together so you can run).
Sentence Starter: Two systems interact when they team up to...
Think like a scientist! Page 1 of 2
Big Science Writing Prompt
Question 3: Why is your body like a machine?
Name:
Body Systems Word Bank Choose at least 2 systems to write about!
skeletal system muscular system nervous system digestive system excretory system circulatory system respiratory system
Pumps & Pipes
Circulatory
Control & Wires
Nervous
Frame & Motors
Skeletal & Muscular
Fuel & Filters
Digestive & Excretory
✍️ Your Mission: Write 3 to 5 complete sentences explaining:
• Why do people compare the human body to a complex machine? • Pick two systems from the word bank and explain how they work like parts of a machine. • What is one thing your living body can do that a robot or car cannot do?
Remember: Capital letters, complete thoughts, and periods! Page 2 of 2
