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Forces on a Ramp

Investigate how mass, angle, and surface affect the motion of an object on a ramp.

  1. Choose one independent variable — ramp angle, box mass, or surface material.
  2. Keep the other two the same for every trial. This makes it a fair test.
  3. Set the angle using the presets (15°, 30°, 45°) or the slider.
  4. Press "Release box" — a 3-2-1-GO! countdown plays. The black bar holds the box until GO!
  5. Record your results — the data table fills in automatically. If friction is too strong, the table records "⛔ Held".
  6. Press Reset, change your variable, and repeat up to 4 trials per combination.
  7. Analyze your data — why do trials vary slightly? Does mass affect acceleration? Does angle? Does surface?
Fair test reminder: Change only ONE variable at a time! Small differences between trials are normal — that's why scientists run multiple trials and average the results.

What is an inclined plane?

A ramp redirects gravity so an object slides along a slope. The steeper the angle, the stronger the pull along the surface.

Static vs. kinetic friction

Static friction holds the box at rest. Kinetic friction acts while sliding — it is always less than static friction.

Why do trials vary slightly?

In real experiments, tiny variations in surface texture and starting conditions cause each trial to differ slightly. That's why scientists run multiple trials and calculate an average!

Key equations

Acceleration (m/s²) = g × sin(θ) − μk × g × cos(θ)Mass cancels out — acceleration does NOT depend on mass!
Static check: box moves only if g × sin(θ) > μs × g × cos(θ)i.e. tan(θ) > μs — if not, the table shows ⛔ Held
Try to predict: Calculate the expected acceleration before each run, then compare to the result!
Ramp angle
30°
5 kg
Surface
Acceleration
—
m/s²
Time to bottom
—
seconds
Final speed
—
m/s at bottom
Set the angle, choose a surface, and release the box!
Data Table: Forces on a Ramp
Numbers = acceleration in m/s²  |  ⛔ Held = static friction prevented sliding
Surface Angle Mass
(kg)		 Acceleration (m/s²) Average
Accel. (m/s²)
Trial 1 Trial 2 Trial 3 Trial 4