A cardboard pinball machine is a fun school project that turns simple materials into a working game. By building ramps, bumpers, walls, and a plunger, students can see how forces change the motion of a rolling ball. The project connects art, engineering, and physics in a hands-on way.
It also encourages testing and improving a design instead of expecting it to work perfectly the first time.
The ball moves because gravity pulls it down the tilted board, while the plunger gives it a starting push. Bumpers and walls change the ball's direction by applying contact forces during collisions. Friction from cardboard, tape, and paper slows the ball, so the surface and angle of the ramp matter.
By adjusting slope, bumper placement, and launcher strength, students learn how design choices affect speed, direction, and scoring.
Key Facts
- Gravity pulls the ball downhill along the tilted cardboard board.
- A force can start, stop, speed up, slow down, or change the direction of the ball.
- F = ma means a larger force creates a larger acceleration for the same ball mass.
- A steeper ramp usually makes the ball speed up more because more of gravity acts along the ramp.
- Friction changes kinetic energy into heat and sound, so the ball slows as it rolls.
- Elastic materials like rubber bands can store energy, and stored energy can launch the ball when released.
Vocabulary
- Force
- A force is a push or pull that can change an object's motion.
- Gravity
- Gravity is the attractive force that pulls objects toward Earth.
- Friction
- Friction is a contact force that opposes motion between surfaces that touch.
- Plunger
- A plunger is a launcher that pushes the ball into the pinball machine.
- Collision
- A collision happens when two objects hit each other and exchange forces.
Common Mistakes to Avoid
- Making the board perfectly flat is a mistake because the ball will not roll reliably without a downhill direction from gravity.
- Using weak walls is a mistake because the ball can escape the track or knock parts loose during collisions.
- Placing all bumpers in one small area is a mistake because the ball may get stuck or miss most of the playfield.
- Taping the plunger too tightly is a mistake because extra friction can stop it from sliding smoothly and launching the ball well.
Practice Questions
- 1 A cardboard pinball board is raised 12 cm at the back and is 60 cm long. What is the rise per centimeter of board length, written as a fraction and as a decimal?
- 2 A ball scores 10 points for each bumper hit and 50 points for reaching the top target. If a player hits 6 bumpers and reaches the top target once, what is the total score?
- 3 If the ball keeps stopping before it reaches the bumpers, should you first make the ramp steeper, make the surface rougher, or add more tape to the track? Explain which choice helps and why.