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Experiments​

First Class Levers

Experiment #9 from Exploring Physical Science

Education Level
Middle School

Introduction

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 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 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

  • 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 sensors and equipment. Additional equipment may be required.

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This experiment is #9 of Exploring Physical Science. The experiment in the book includes student instructions as well as instructor information for set up, helpful hints, and sample graphs and data.

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