Vernier Software & Technology

First-Class Levers

Introduction

A lever is a simple machine used to make work easier. It consists of a long, rigid bar with a support that allows the bar to pivot. The point where the bar pivots is the fulcrum. There are three classes of leversâ€”first, second, and third. In this experiment, you will examine first-class levers. Crowbars and scissors are examples of first-class levers. A lever can help you move an object by increasing the force you exert. Mechanical advantage (MA) is a value that tells the number of times a machine increases an applied force. You will use a Force Sensor to measure resistance force and effort force (in newtons). You will then use this information to calculate the mechanical advantage of each lever.

Objectives

In this experiment, you will

• Measure force.
• Calculate actual mechanical advantage (AMA).
• Calculate ideal mechanical advantage (IMA).
• Calculate percent difference.
• Make conclusions about levers.

Sensors and Equipment

This experiment features the following Vernier sensors and equipment.

Additional Requirements

You may also need an interface and software for data collection. What do I need for data collection?

Middle School Science with Vernier

See other experiments from the lab book.

 1 A Hot Hand 2 Heating of Land and Water 3 The Greenhouse Effect 4 Relative Humidity 5 Soil Study 6 Absorption of Radiant Energy 7 Reflectivity of Light 8 Schoolyard Study 9 A Good Sock 10 What Causes the Seasons? 11 Solar Homes 12 Ocean Floor Mapping 13 Boiling Temperature of Water 14 Freezing and Melting of Water 15 How Low Can You Go? 15B Ziplock Ice Cream 16 A Good Cold Pack 17 Lemon "Juice" 18 Get a Grip! 19 Fun with Pressure 20 Water Hardness Study 21 Diffusion: How Fast? 22 A Water Field Study 23 Cooling Rates: Shaq vs. Susie 24 Yeast Beasts in Action 25 Heart Rate and Body Position 26 Heart Rate and Exercise 27 Mapping a Magnetic Field 28 Electromagnets 29 Frictional Forces 30 First-Class Levers 31 Pulleys 32 Buoyancy 33 Graphing Your Motion 34 Speeding Up 35 The Indy 100 35B Pencil Car 36 Crash Dummies 37 Falling Objects 38 A Speedy Slide

Experiment 30 from Middle School Science with Vernier Lab Book

Included in the Lab Book

Vernier lab books include word-processing files of the student instructions, essential teacher information, suggested answers, sample data and graphs, and more.