Forces

The following topic has been broken down into 4 components. Click on the part you wish to learn about in more detail below.

What are ForcesNewtons 3 Laws of Motion
FrictionElectrostatics
GravityMagnetism

WORK PACKAGES FOR ABSENT STUDENTS

During lock down in 2020 much work was put into converting distance education work provided from the NSW Department of Education into a neat printer friendly document. All the content was posted into Teams and is intended to be accessible by students without a Teacher.

If you are absent during this topic, make sure to utilise this resource to stay on top of your class work.

year-8-science-forces-part-1Download
year-8-science-forces-part-2Download
year-8-science-forces-part-3Download

Topic Revision

There are some activities in BOLD throughout the different headings which you are encouraged to write revision notes about in your books.

Forces

  • A force is a push or a pull or a turn
  • List some examples of forces.
  • Balanced and unbalanced forces and calculate net force.
  • Forces can speed up, slow down or change the direction of an object.
  • Forces can be applied by Contact or Non-Contact (at a distance) and those applied at a distance have a field around them.
  • Forces have size and direction and are measured in Newtons (N)
  • Measure the size of forces.
Image result for force diagram
https://study.com/academy/lesson/using-force-arrows-in-physics-diagrams.html
Image result for contact non contact forces
Image result for forces are measured in newtonshttps://slideplayer.com/slide/9299459/

Frictional forces

  • Friction is a contact force which acts in the opposite direction to motion
  • Friction is both good and bad.
  • Identify where friction is good and technology is used to increase it
  • Identify where friction is bad and technology is used to decrease it
  • Importance of friction in everyday situations (starting and stopping)

Electrostatics

  • Describe ways objects become charged.
  • Identify the two types of charge (+ & -)
  • State the rules of attraction & repulsion.
  • Identify that there is a field around a charged object.
  • Draw diagrams of the effect of charged objects on each other
  • Give examples of everyday situations of electrostatic forces

Magnets

  • Identify the two types of magnetic pole (N & S)
  • State the rules of attraction & repulsion.
  • Define the term ‘field’ and identify the field around a magnet.
  • Draw magnetic fields around bar magnets
  • Describe the effect of magnetic poles on each other
  • Identify everyday uses of magnets and electromagnets

Gravity

  • Identify that all objects exert a force of gravity on all other objects
  • Identify examples of gravitation forces
  • Define mass and weight and the difference
  • Identify that gravity acts on us through a field.