<< Chapter < Page Chapter >> Page >

Technology

Grade 5

Machines made easy

Module 2

Levers

Let’s look at levers

One of the easiest ways to lift a heavy object is by using a lever.

Assignment

  1. What is a lever?

A lever is a beam that rests on something or that is attached to something and it works on this point of support or fulcrum.

  1. How does a lever work?

By applying a force a heavy load can be moved relatively easily.

  1. We get three main types of levers, namely:

Type1: A lever where the fulcrum is between the load and the force, e.g. a balancing scale.

Type 2: A lever where the load is between the force and the fulcrum, e.g. a wheelbarrow.

Type 3:

A lever where the force is between the load and the fulcrum, e.g. a man who is fishing.

  1. INVESTIGATION.

Do the following experiments on the type 1 lever in groups.

  1. What materials do you need?

a long metal woodwork ruler;

a small block of wood / eraser / round container

a medium-sized coffee tin with a lid / a pill container

drawing pins / paper clips

Experiment 1

  • Aim:

To determine how a lever works.

  • Method:

Make a lever by placing the metal rule on the block of wood.

Place the block of wood under the 15 cm mark on the ruler.

Fill the tin halfway with sand.

Place the tin of sand on the 0 cm mark on the ruler.

Now press on the ruler at the 30 cm mark.

Fill the tin completely with sand.

Press on the ruler at the 30 cm mark again.

Lift the empty tin and note how heavy it is.

  • Observation :

Is the half filled container lifted?

Is the full container lifted?

  • Conclusion :

Was it just as difficult as when you tried to lift the tin by yourself?

Assignment

Make a sketch with labels of experiment 1.

[LO 1.12]

  1. Experiment 2
  1. Aim :

To determine what will happen if we move the fulcrum.

  1. Method :
  1. Place the block of wood under the 20 cm mark on the ruler.

Place the half-filled container with drawing pins on the 0 cm mark on the ruler.

Now press on the ruler at the 30 cm mark.

OR

  1. Place the block of wood under the 10 cm mark on the ruler.

Place the filled container with drawing pins on the 0 cm mark on the ruler.

Now press on the ruler at the 30 cm mark.

  1. Observation :

Choose the correct word in brackets:

It is easiest to lift the container with drawing pins when the fulcrum is ( closest to/furthest away from ) the container with drawing pins. The experiment that proves this is attempt 2 (X / Y).

In attempt 2 (X / Y) the distance that you have to press down is the shortest.

  1. Conclusion :

The further away the pressure is from the (pivot / fulcrum), the greater is the pushing force exercised on the container, therefore making it easier to lift.

  1. Experiment 3
  1. Aim :

To determine where to push on a lever to obtain the best result.

What materials do you need?

A ruler.

A pencil.

2c coins.

  1. Method :

Place the pencil under the ruler in the middle. Place a coin at the one end of the ruler.

Let the other coin fall from a height of 30 cm to hit the ruler in the middle between the fulcrum and the other end.

  1. Observation :

Complete the illustration by drawing your observation.

Repeat steps 1 and 2 of the method, but let the coins fall on the edge of the ruler.

  • Observation : The coin shoots (higher/lower) if the coin falls on the edge.
  • Conclusion : The further away the pressure from the fulcrum, the greater the pushing force.
  • Self-assessment

How did my group do in the experiments?

Write down the names of the learners in the group.

Write “yes” or “know” next to numbers 1 to 8.

My group followed the instructions.
My group worked as a team.
We enjoyed the experiments.
We did well.
We helped and supported one another if something was not clear.
I listened to the other group members.
We all did the same amount of work.
I enjoyed working with my group.

9. If your answer to 7 is no , answer the following questions:

  1. Who did the most? Why?
  2. Who did the least? Why?
  3. Discuss your answers in your group. Have you learned anything from this assignment? If so, write down what you have learned.

[LO 1.3]

Assessment

LO 1

TECHNOLOGICAL PROCESSES AND SKILLS

The learner will be able to apply technological processes and skills ethically and responsibly, using appropriate information and communication technologies.

We know this when the learner:

Investigates:

1.2 finds out about existing products relevant to a problem, need or opportunity, and identifies some design aspects (e.g. who it is for, what it looks like, what it is for, what it is made of);

  • performs, where appropriate, scientific investigations about concepts relevant to a problem, need or opportunity using science process skills:

1.3.1 planning investigations;

  • conducting investigations;

1.3.3 processing and interpreting data;

1.3.4 evaluating and communicating findings.

Makes:

1.7 outlines a plan that shows the steps for making, including drawings or sketches of main parts;

1.8 uses suitable tools and materials to make products by measuring out, cutting or separating, shaping or forming, joining or combining, and finishing the chosen material;

Evaluates:

1.10 evaluates, with assistance, the product according to the design brief and given specifications and constraints (e.g. people, purpose, environment), and suggests improvements and modifications if necessary;

1.11 evaluates the plan of action followed and suggests improvements and modifications if necessary;

Communicates:

  • produces labelled two-dimensional drawings enhanced with colour where appropriate.

LO 2

TECHNOLOGICAL KNOWLEDGE AND UNDERSTANDING

The learner will be able to understand and apply relevant technological knowledge ethically and responsibly.

We know this when the learner:

Systems and control:

  • demonstrates knowledge and understanding of how to use energy sources to power mechanical systems in order to make a product move in some way.

Questions & Answers

can someone help me with some logarithmic and exponential equations.
Jeffrey Reply
sure. what is your question?
ninjadapaul
20/(×-6^2)
Salomon
okay, so you have 6 raised to the power of 2. what is that part of your answer
ninjadapaul
I don't understand what the A with approx sign and the boxed x mean
ninjadapaul
it think it's written 20/(X-6)^2 so it's 20 divided by X-6 squared
Salomon
I'm not sure why it wrote it the other way
Salomon
I got X =-6
Salomon
ok. so take the square root of both sides, now you have plus or minus the square root of 20= x-6
ninjadapaul
oops. ignore that.
ninjadapaul
so you not have an equal sign anywhere in the original equation?
ninjadapaul
Commplementary angles
Idrissa Reply
hello
Sherica
im all ears I need to learn
Sherica
right! what he said ⤴⤴⤴
Tamia
what is a good calculator for all algebra; would a Casio fx 260 work with all algebra equations? please name the cheapest, thanks.
Kevin Reply
a perfect square v²+2v+_
Dearan Reply
kkk nice
Abdirahman Reply
algebra 2 Inequalities:If equation 2 = 0 it is an open set?
Kim Reply
or infinite solutions?
Kim
The answer is neither. The function, 2 = 0 cannot exist. Hence, the function is undefined.
Al
y=10×
Embra Reply
if |A| not equal to 0 and order of A is n prove that adj (adj A = |A|
Nancy Reply
rolling four fair dice and getting an even number an all four dice
ramon Reply
Kristine 2*2*2=8
Bridget Reply
Differences Between Laspeyres and Paasche Indices
Emedobi Reply
No. 7x -4y is simplified from 4x + (3y + 3x) -7y
Mary Reply
is it 3×y ?
Joan Reply
J, combine like terms 7x-4y
Bridget Reply
im not good at math so would this help me
Rachael Reply
yes
Asali
I'm not good at math so would you help me
Samantha
what is the problem that i will help you to self with?
Asali
how do you translate this in Algebraic Expressions
linda Reply
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali Reply
the Beer law works very well for dilute solutions but fails for very high concentrations. why?
bamidele Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
Good
Got questions? Join the online conversation and get instant answers!
QuizOver.com Reply

Get the best Algebra and trigonometry course in your pocket!





Source:  OpenStax, Technology grade 5. OpenStax CNX. Sep 23, 2009 Download for free at http://cnx.org/content/col10979/1.2
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Technology grade 5' conversation and receive update notifications?

Ask