 Vernier Software & Technology

# Levers as Machines

## Introduction

A lever is a simple machine used to make work easier. It consists of a 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 levers: 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 the force sensor built into a Sensor Cart to measure resistance force and effort force. You will then use this information to calculate the mechanical advantage of each lever.

## Objectives

• Measure force.
• Calculate actual mechanical advantage (AMA).
• Calculate ideal mechanical advantage (IMA).
• Calculate percent difference.

## Sensors and Equipment

This experiment features the following Vernier sensors and equipment.

### Option 2

Graphical Analysis 4

## Exploring Motion and Force with Go Direct® Sensor Cart

See other experiments from the lab book.

 1 Investigating Friction 2 Levers as Machines 3 Pulleys as Machines 4 Ramps as Machines 5 Getting Faster 6 Crash Test 7 Newton's Second Law

### Experiment 2 from Exploring Motion and Force with Go Direct® Sensor Cart 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.