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Levers - PowerPoint PPT Presentation

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Levers. Today’s Lesson. More information on levers How to write an experiment Introduction to Design Task Start Design Task. Levers. A lever has three different areas: Fulcrum: A fulcrum is the point where a lever rests or is supported.

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Today s lesson
Today’s Lesson

  • More information on levers

  • How to write an experiment

  • Introduction to Design Task

  • Start Design Task


  • A lever has three different areas:

    • Fulcrum: A fulcrum is the point where a lever rests or is supported.

    • Load: The area where weight is carried or moved. The opposition to applied force.

    • Effort: The force applied to an object or machine to cause motion.

1 st class levers
1st Class Levers

  • First class levers are force multipliers.

  • Having the load close to the fulcrum will have a high mechanical advantage.

  • Having the load far from the fulcrum will have a low mechanical advantage.

  • Examples include scissors, can opener, elbow etc.

Second class lever
Second Class Lever

  • Second class levers go in this order.

    • Fulcrum

    • Then Load

    • Then Effort

  • Examples include nut crackers, wheel barrows and your jaw.

  • They are force multipliers which make our job easier.


Third class levers
Third Class Levers

  • Third class levers are speed multipliers – which means a lot of force can occur in a small area.

  • Third class levers go in this order:

    • Fulcrum

    • Then Effort

    • Then Load


Write down the following questions in your notes book and answer them in sentences.

  • What are the main differences between the three types of levers? Explain.

  • What are the main uses for the 3 different types of levers?

  • Give 2 examples of each lever which were not mentioned in this PPT.

Research question hypothesis
Research Question & Hypothesis

  • A Research Question is a question that you are trying to answer through doing the experiment

  • A hypothesis is a scientific guess on what you expect to happen. Be specific with your hypothesis.


  • The variables are things you change to make the experiment fair. They are:

    • Controlled Variable: What are you going to control?

    • Independent Variable: What are you going to change?

    • Dependant Variable: What are you going to keep the same?

Apparatus method
Apparatus & Method

  • Your apparatus is the equipment that you need for the experiment

  • Your method is a step by step instruction on what you are going to do in the experiment.

  • Your method should be able to be followed by someone not in your group!!

Equipment setup risk assessment
Equipment Setup & Risk Assessment

  • Equipment Setup is a drawing of how you are going to set up your experiment. It helps you think about what you are going to do.

  • Risk Assessment is where you write what dangers there are and what your doing to minimize or get rid of them.

Our assessment task
Our Assessment Task

  • This is your most important assessment task in Science as it covers 3 criteria. Here is a breakdown on the main assessment tasks on Science:

    • Essay/Teaching Toolbox (Criteria A + B)

    • Test (Criteria C)

    • Design Task (Criteria D, E & F)

Our criteria
Our Criteria

  • Criteria D (Scientific Inquiry) – Research question, hypothesis, variables, equipment, method, suggests improvement to experiment, discusses errors in method etc.

  • Criteria E (Processing Data) – collect and present data such as tables and graphs, discuss the data, draw trends from the data, draws a conclusion from the results

  • Criteria F (Attitudes to Science) – works safely, can be independent, can work in groups, uses equipment competently.

What we will do
What We Will Do!

  • Get into groups of 2 or 3. A group of 4 is unacceptable. If any group asks to be in a 4 (or larger), I will choose groups.

  • You will decide on an idea of Forces, Magnetism or Simple Machines that you want to look at.

  • You will design your own experiment – copying and pasting from the internet will get you a 0.

Our timeline
Our Timeline

  • This lesson, we will start by choosing an experiment.

  • You need to get permission from me before you start the write up. It’s not worth wasting time if you can’t do the experiment!

  • Your experiment must collect data. No data (length, force, time etc) = low Criteria E mark.

  • We will probably start the experiment after field studies.