# Pulleys: change the force

TLF ID L1199

Help warehouse workers lift crates using a rope and pulleys. Explore relationships between mass, force, distance and work. Notice that pulleys change the direction of a force and make it easier to lift loads. Identify the number of workers needed to lift a range of weights. This learning object is one of three objects in a series. The series is also packaged as a combined learning object.

#### Educational details

Key learning objectives
• Students identify that pulleys change the direction of an applied force.
• Students identify mathematical relationships between mass, force, distance and work.
Educational value
• Describes common devices that use pulleys and explains how a pulley makes it easier to lift loads by changing the direction of a force.
• Introduces SI units used for measuring mass (kilogram) and force (newton).
• Defines the concept of ‘work done’ (force x distance).
• In a warehouse scenario, students identify the number of workers needed to lift a given mass.
• Students analyse data tables to work out mathematical relationships between load mass, number of pulleys, force, distance rope is pulled and work done.
• Understanding of key concepts is tested through quizzes.
• Random generation of worker strengths (newtons) supports repeated use.
Year level

7

TopicsMotion
Learning area
• science
Strand
• Science/Physical sciences
• Science/Science understanding
Concept
• Science/Newton's Laws
• Science/Force
• Science/Work ( Science)
Skill
• Knowledge;
• Comprehension;
• Application;
• Analysis
Student activity
• Interactives;
• Experiment;
• Analysis;
• Modelling
Learning design
• Experiential learning;
• Independent learning;
• Problem solving;
• Visual learning

#### Other details

Contributors
• Script writer
• Name: Rod Rees
• Organisation: Rees Films Pty Ltd
• Address: Blackburn VIC 3130 Australia
• Technical implementer
• Publisher
• Date of contribution: 28 Jan 2014
• Organisation: Education Services Australia
• Address: Melbourne VIC 3000 Australia
• URL: http://www.esa.edu.au/
Access profile
• Colour independence
• Device independence
• Hearing independence
Learning resource type
• Interactive Resource
Browsers
• Microsoft Internet Explorer - minimum version: 8.0 (MS-Windows) - maximum version: 9.0 (MS-Windows)
• Firefox - minimum version: (MS-Windows)
• Safari - minimum version: 5.1 (MacOS)
Operating systems
• MacOS - minimum version: 10.6
• MS-Windows - minimum version: XP - maximum version: 7
Rights
• © Education Services Australia Ltd, 2013, except where indicated under Acknowledgements.

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