Pulley Challenge. We begin by exploring what you may already know about pulleys. Pages 2 should be answered INDIVIDUALLY.

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2 Brainstorming INDIVIDUALLY: Write down anything you know about pulleys. You may draw pictures along with your words. 2

3 Pulley Group Questions In a few minutes, you will be experimenting with model pulleys. Below, write down any questions you still have about pulleys. Feel free to also include any non-science issues that may affect your pulley choice. 3

4 Pulley Hands-On Experiment Use the available materials to set up and test some pulley systems. You may try different pulley systems out, but be sure to record your data for each system in the table below. Pulley Basics To the right are examples of pulley systems we will investigate. Use an object of mass 500 g as the mock pool table in your experiment. Pull the string at the end of the pulley not attached to the object, such that the object moves up a distance 0.10 m Use the chart below to record your data and calculate the information needed to complete the table. A B C D A- Single Fixed B- Single Movable C- Single Compound D- Double Compound Load (N) = 4.9 N (due to the 500 g object that you are lifting) Pulley System Did the direction of force change? (circle one) Effort Force (N) Distance Pulled to Move Object (m) Distance Object Moved* (m) Work (J) Potential Energy (J) Mechanical Advantage MA # of Supporting Strands* Single Fixed Yes / No 0.10m Single Movable Yes / No 0.10m Single Compound Double Compound Yes / No 0.10m Yes / No 0.10m *Supporting strands are the vertical sections of rope that pull up on the pulley system. Reminder: Work = Effort force x Distance Pulled Potential Energy = Load x Distance Object Moved Mechanical Advantage (MA) = Load Effort Force 4

5 1. Based on your data, which pulley system required the smallest effort (force) to lift the load? 2. Based on your data, when you increase the distance you pull to lift the object to a certain height, how does it affect the effort force required? 3. Based on your data, how does the distance you pull compare to the distance the object moved for the pulley with the smallest effort force? 5

6 4. Based on your data, when you changed the pulley system, how did it affect the work required to lift the object? 5. Based on your data, how does work compare to potential energy for a given pulley system? 6. Which pulley system gave you the greatest mechanical advantage? 6

7 7. Based on your data, when you increase the number of supporting strands, how does it affect the mechanical advantage? (Supporting strands are the vertical sections of rope that pull up on the pulley.) 8. What is the difference between effort force, work, potential energy and mechanical advantage? 7

8 Challenge What would be the best pulley system to use to get the pool table into the van? Explain your answer based on what you have learned from this unit. How did the experiments conditions differ from those you would encounter with a real-life pulley system and pool table? 8

Pulley Challenge. We begin by exploring what you may already know about pulleys. Pages 2 should be answered INDIVIDUALLY.

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