1 / 17

# Levers - PowerPoint PPT Presentation

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.

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.

## PowerPoint Slideshow about 'Levers' - verdi

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

• How to write an experiment

• 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.

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 levers go in this order.

• Fulcrum

• Then Effort

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

• They are force multipliers which make our job easier.

• 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

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.

• 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?

• 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 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.

• 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)

• 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.

• 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.

• 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.