Science activity
Simple Machines Hunt
Explore ramps and levers! Roll cars down ramps of different heights and use a board as a seesaw lever to lift heavy toys.
Materials and setup
- board or cardboard for ramp
- books for stacking
- toy cars
- spool
- string
- small bucket
- pencil
- paper
How this changes by age
Pre-K (ages 3–4)
Explore ramps and levers! Roll cars down ramps of different heights and use a board as a seesaw lever to lift heavy toys.
Steps
- Make a ramp with a board propped on a stack of books.
- Roll a toy car down the ramp. Change the height: 'What happens with more books?'
- The car goes faster! Taller ramp = faster car.
- Make a lever: balance a board on a round object. Put a heavy toy on one end.
- GENTLY press down on the other end and watch the toy rise up (don’t launch it — flying toys can hurt people). 'The lever helps us lift heavy things!'
- Tell a grown-up one thing that surprised you.
Learning objectives
- Explore how ramps (inclined planes) affect the speed of rolling objects
- Experiment with levers to move heavy objects
- Understand that simple machines help us do work
Kindergarten (ages 5–6)
Hunt for simple machines around the house and yard. Identify ramps, levers, wheels, pulleys, and screws. Test how they make work easier.
Steps
- Learn about 4 simple machines: ramp, lever, wheel, and pulley.
- Hunt around the house for examples: door handle = lever, wheelchair ramp = inclined plane, wagon = wheel and axle.
- Build a simple pulley with a spool and string to lift a small bucket.
- Test: is it easier to lift the bucket with the pulley or by hand?
- Draw each simple machine you found and label how it helps.
- Tell a grown-up one thing that surprised you.
Learning objectives
- Identify 4 types of simple machines in everyday objects
- Understand that simple machines reduce the effort needed for tasks
- Build and test a simple pulley system
Early elementary (ages 6–8)
Investigate all 6 simple machines, measure mechanical advantage, and design a Rube Goldberg machine that uses at least 3 simple machines in sequence.
Steps
- Learn all 6 simple machines: lever, inclined plane, wedge, screw, wheel and axle, pulley.
- Find or build an example of each. For each one, describe what it does and how it makes work easier.
- Measure mechanical advantage for a ramp: compare the force needed to lift an object straight up vs. pulling it up a ramp. Use a spring scale if available, or use subjective 'effort rating' (1-10).
- Calculate: a ramp is 2 meters long and 0.5 meters high. Mechanical advantage = length/height = 4. That means the ramp makes the job 4 times easier!
- Design and build a Rube Goldberg machine that uses at least 3 simple machines in sequence to accomplish a simple task (pop a balloon, ring a bell, push a ball into a cup).
- Draw a diagram of your Rube Goldberg machine, label each simple machine, and explain how energy transfers from one step to the next.
- In one sentence, tell a parent or sibling what surprised you today.
Learning objectives
- Identify and explain all 6 types of simple machines
- Calculate basic mechanical advantage for inclined planes
- Design and build a multi-step machine demonstrating energy transfer
Upper elementary (ages 8–10)
Study mechanical engineering principles: calculate mechanical advantage, explore compound machines, analyze force and work (W = F x d), and design an original machine to solve a real problem.
Steps
- Review all 6 simple machines and their mechanical advantage formulas. Calculate MA for: a lever with effort arm 60 cm and load arm 20 cm; a pulley system with 3 supporting ropes; a ramp 3 m long and 1 m high.
- Research compound machines: a bicycle is a compound machine using wheels, axles, levers, and pulleys. Identify the simple machines in 3 compound machines (scissors, wheelbarrow, fishing rod).
- Learn the physics: Work = Force x Distance. If you push a box with 10 Newtons of force across 5 meters, you do 50 Joules of work. Calculate work for 5 different scenarios.
- Design an original machine to solve a real problem in your home (e.g., a pet feeder, a device to turn off a light from bed, a book holder). It must use at least 2 simple machines.
- Build a prototype of your machine. Test it. What works? What needs improvement? Redesign and test again.
- Write an engineering report: the problem, your design with labeled diagrams, mechanical advantage calculations, test results, and what you would improve in version 3.
- In one sentence, tell a parent or sibling what surprised you today.
Learning objectives
- Calculate mechanical advantage for all 6 simple machine types
- Apply the formula Work = Force x Distance to real-world scenarios
- Follow the engineering design process: identify problem, design, build, test, iterate, and document
Safety and evidence note
Read the full activity before beginning. An adult should supervise tools, heat, food, outdoor work, movement, and experiments as appropriate. Completion records that the activity was done; the child’s explanation, work sample, photo, or demonstration is stronger evidence of learning than a completion check alone.
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