Student Exploration Pulley Lab Answer Key 2021 -

True or false – Adding more pulleys always increases efficiency. A4: False – Mechanical advantage increases, but friction increases, reducing efficiency. Key Concept: Compound pulleys multiply force but sacrifice distance and add friction. Comparison Table (Quick Answer Key Reference) | Pulley Type | MA (Ideal) | Effort for 100N Load | Pull distance for 1m lift | Force direction change? | |----------------------|------------|----------------------|----------------------------|--------------------------| | Single fixed | 1 | 100 N | 1 m | Yes | | Single movable | 2 | 50 N | 2 m | No (still up) | | Compound (2 pulleys) | 4 | 25 N | 4 m | Yes | | Compound (3 pulleys) | 6 | ~16.7 N | 6 m | Yes | Sample Calculation Questions (With Answers) Q: A pulley system has an actual MA of 3.5 and an ideal MA of 4. If you lift a 140 N load, what is the actual effort force? A: Actual MA = Load ÷ Actual Effort → 3.5 = 140 N ÷ Effort → Effort = 140 ÷ 3.5 = 40 N

To raise the load 1 meter, how far must you pull the rope? A3: 2 meters (distance doubles) student exploration pulley lab answer key

By: The STEM Educator Team