I can design and test a pulley system and explain how it changes force, distance, and mechanical advantage.
POE Unit 1 • Lesson 1.5
Pulley Systems and Lifting Mechanisms
Focus question: How can pulley systems help a mechanism lift a load with measurable mechanical advantage?
Mission Briefing
Today’s Plan
A focused lesson sequence that builds toward the VEX Rover Mechanisms Challenge.
Opening promptConcept voteAerospace linkCompare optionsEvidence challengeQuick checkExit ticket
Lesson Targets
What You Will Be Able to Do
Pulley system test notes and calculation evidence
The pulley configuration, supporting rope segments, input force, and input distance are all consistent.
Activity Flow
How the Lesson Moves
This page highlights the lesson elements you need for practice, evidence, and submission.
1. Trace the load path
Count only rope segments that directly support the moving load.
2. Predict mechanical advantage
Estimate ideal input force and required pull distance.
3. Evaluate a lifting task
Select a configuration that meets the force limit without ignoring distance or complexity.
Lesson Interactive
Configure a Payload Lift
A 120 N payload must be lifted 0.50 m. Configure an ideal pulley system requiring no more than 35 N of input force.
Pulley Configuration
Only rope segments directly supporting the moving load contribute to ideal mechanical advantage.
Ideal Prediction
Input force
Rope pulled
Increase supporting segments until the force requirement is met, then note the distance tradeoff.
Today’s Work
Main Deliverable
Pulley System Test Notes and Calculation Evidence
Document one pulley configuration and its lifting performance.
- Include a labeled rope-path sketch and the number of supporting segments.
- Compare predicted and measured input force and explain any difference.
Exit Ticket
Mission Debrief
One way today’s lesson connects to an aerospace mechanism or VEX rover system.
One type of evidence you could use to support a design decision.
One question you still have about mechanisms, energy, power, or the Unit 1 challenge.
Resources
Lesson Resources
Principles of Engineering
Return to the POE course hub for units, resources, certifications, and current course information.
VEX Rover Mechanisms Challenge
Use this unit project context when connecting the lesson to mechanism planning, testing, and design review evidence.