Investigating motion (Edexcel GCSE Physics): Revision Notes
📚 Revision Notes
Investigating motion
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Trolley on a Ramp Experiment
This experiment investigates how mass and force affect the motion of a trolley on a ramp. Here's a step-by-step guide:
- Set up the equipment:
- Measure the mass of the trolley, the hanging masses, and the hook.
- Adjust the height of the ramp until the trolley just starts to move freely down the ramp when released.
- Mark the ramp:
- Mark a line on the ramp just before the first light gate. This ensures the trolley starts from the same position and travels the same distance every time.
- Attach the trolley:
- Attach the trolley to the hanging mass using a string that passes over a pulley at the end of the ramp.
- Measure the speed and time:
- Place light gates along the ramp to measure the speed of the trolley as it passes through.
- The first light gate records the initial speed, and the second records the final speed.
- The time it takes for the trolley to pass between the two light gates is used to calculate the trolley's acceleration.
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Calculating Acceleration:
- Initial speed: This is the speed when the trolley passes through the first light gate.
- Final speed: This is the speed when the trolley passes through the second light gate.
- Time: This is the time taken to pass between the two light gates.
Optional Tools:
- You can use a rolling tape measurer and markers to measure the distances on the ramp.
- For longer time intervals (if no light gates are available), a stopwatch could be used, but it is less accurate.
Investigating the Effects:
- Effect of the Trolley's Mass:
- To investigate how the mass of the trolley affects its motion, you can add masses to the trolley and repeat the experiment.
- Observe how increasing the mass affects the trolley's speed and acceleration.
- Effect of the Accelerating Force:
- The accelerating force can be changed by varying the mass on the hook.
- Start with all the masses on the trolley, then transfer masses from the trolley to the hook one by one.
- This increases the force pulling the trolley down the ramp and affects its acceleration.
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Key Concept:
- Newton's Second Law of Motion states that acceleration is directly proportional to the force applied and inversely proportional to the mass. By adjusting the trolley's mass and the accelerating force, you can observe how these factors influence motion.