Ramp & Load: Acceleration on an Incline
1 · Predict
If you release the load from rest and steepen the ramp's angle, what happens to its speed after the same amount of time?
- It speeds up faster — a steeper ramp gives a larger acceleration.
- It reaches the same speed — angle doesn't affect how fast it accelerates.
- It speeds up slower — a steeper ramp gives a smaller acceleration.
2 · Set Up
- Open the Ramp & Load preset in the mechanics sandbox.
- Select the ramp and use the Inspector to set its incline angle for this trial.
- Release the load from rest at the top and read its speed off the probe after the listed elapsed time.
3 · Collect Data
| Ramp angle (deg) | Load mass (kg) | Elapsed time (s) | Speed (m/s) | Kinetic energy (J) |
|---|---|---|---|---|
| 10 | 3 | 1 | ||
| 20 | 3 | 1 | ||
| 30 | 3 | 1 |
Plot speed (y-axis) against ramp angle (x-axis) for the fixed 1 s trials. Is the relationship a straight line?
4 · Analyze
- Using v = g sin θ · t, compute the expected speed for each row and compare it to what you read off the probe.
- The load's mass stays fixed at 3 kg across all three trials while the angle changes. What does that tell you about the relationship between mass and acceleration on a frictionless ramp?
5 · Extend
- Two loads of different mass are released from the same angle at the same time. Which one reaches the bottom first? Use your data to justify your answer.
- Real ramps have friction. If this ramp weren't frictionless, would the measured speed be higher or lower than your v = g sin θ · t prediction, and why?
The Physics Behind This Experiment
Kinetic Energy
The load's kinetic energy grows with the square of its speed as it accelerates down the ramp — doubling the speed quadruples the KE.
Gravitational Potential Energy
On a frictionless ramp, the gravitational PE the load loses as it descends converts entirely into the kinetic energy it gains — nothing is lost to heat.