Science activity
Force and Motion Lab
Push and pull! Explore what makes things move, stop, and change direction. Race cars, roll balls, and discover forces.
Materials and setup
- toy cars
- balls
- ramp materials
- magnets
- balloons
- tape
- ruler
- timer
How this changes by age
Pre-K (ages 3–4)
Push and pull! Explore what makes things move, stop, and change direction. Race cars, roll balls, and discover forces.
Steps
- Push a toy car gently, then hard. What's different? A bigger push makes it go farther.
- Roll a ball on the carpet and then on a hard floor. Where does it roll farther? Why?
- Pull a wagon or box with a string. Is it easier with light things or heavy things inside?
- Try to stop a rolling ball. What happens? You need a force to stop it.
- Sort movements: which things need a push? A pull? Both?
- Tell a grown-up one thing that surprised you.
Learning objectives
- Understand that pushes and pulls are forces that cause movement
- Observe that bigger forces create bigger changes in motion
- Identify friction as a force that slows things down
Kindergarten (ages 5–6)
Investigate gravity, friction, and magnetism. Experiment with how different surfaces and slopes affect how objects move.
Steps
- Drop different objects from the same height: a ball, a feather, a piece of paper. Which lands first? Why? (Gravity pulls them all down the SAME amount — the difference is air resistance: the feather and paper catch more air and fall slower. In a vacuum with no air, they would all land at the same moment!)
- Test friction: slide a block on sandpaper, carpet, and a smooth table. Where does it slide easiest?
- Explore magnets: which objects stick to a magnet? Test 10 household items.
- Ramp experiment: release a car from different heights. Measure how far it rolls. Record in a chart.
- Draw arrows on pictures to show which direction forces are acting (gravity pulling down, push going forward).
- Tell a grown-up one thing that surprised you.
Learning objectives
- Identify gravity, friction, and magnetism as forces
- Test how different surfaces affect friction
- Record experimental data in organized charts
Early elementary (ages 6–8)
Study Newton's laws of motion through experiments. Investigate inertia, acceleration, and balanced vs. unbalanced forces.
Steps
- Newton's 1st Law (inertia): stack a coin on a card on a glass. Flick the card. The coin drops straight down. Why?
- Newton's 2nd Law: push the same car with different forces. More force = more acceleration. Push different mass objects with the same force.
- Newton's 3rd Law: blow up a balloon and release it. The air pushes backward, the balloon goes forward. Action and reaction!
- Build a balloon-powered car. How can you make it go farther?
- Draw force diagrams for 5 situations showing all forces with labeled arrows.
- Write Newton's 3 laws in your own words with your own examples.
- In one sentence, tell a parent or sibling what surprised you today.
Learning objectives
- Demonstrate Newton's three laws of motion through experiments
- Explain the relationship between force, mass, and acceleration
- Create force diagrams showing balanced and unbalanced forces
Upper elementary (ages 8–10)
Apply physics concepts: calculate speed, investigate momentum, explore potential and kinetic energy, and analyze real-world force scenarios.
Steps
- Calculate speed: time a toy car over a measured distance. Speed = distance / time. Compare speeds on different surfaces.
- Investigate momentum: roll two balls of different masses at the same speed into a target. Which moves the target more?
- Study potential and kinetic energy: a ball at the top of a ramp has potential energy; rolling, it has kinetic energy. Where is each greatest?
- Build a marble roller coaster from cardboard tubes. The first hill must be the tallest. Why? (Energy conservation)
- Analyze forces in sports: draw force diagrams for a pitched baseball, a kicked soccer ball, and a swimmer.
- Revisit Newton's 3rd Law carefully: a book resting on a table is a classic trap. 'Gravity pulls the book down / the table pushes the book up' is NOT a 3rd-law action-reaction pair — those are two DIFFERENT forces on the same object that happen to balance (a 1st-law balanced-force situation). The real 3rd-law pairs are: (1) Earth pulls the book down / the book pulls Earth up. (2) The book pushes the table down / the table pushes the book up. Those are two SEPARATE action-reaction pairs — don't mix them into one. 3rd-law pairs always act on two DIFFERENT objects and are always equal in size and opposite in direction.
- Write a physics analysis of a roller coaster ride: identify where potential and kinetic energy are greatest and where forces act.
- In one sentence, tell a parent or sibling what surprised you today.
Learning objectives
- Calculate speed using distance and time measurements
- Explain momentum and its relationship to mass and velocity
- Identify correct Newton's 3rd-law action-reaction pairs and distinguish them from 1st-law balanced forces
- Analyze energy transformations between potential and kinetic energy
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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