Force fields

• Force field in physics is a space where non contact force has an effect
• Magnetic field

  has 2 ends called the north and south pole. A north and south pole will attract eachother.
• You can find the shape of a magnetic field using a small compass. The arrows show the direction

  a north pole would move. the field is strongest where the lines are closer together
• An object that has mass has a gravitational field around it. When two objects are in eachothers gravitational field they attract eachother
• Gravitation field strength

  weight(N)= mass(kg) x g (N/KG)
• The greater the mass or the higher it is moved the more gravitational potential energy it stores

  GPE(joules) = height(m) x10 x g
• Static electricity

  a charge of static electricity can build up when 2 different materials rub together.
• When you rub two insulating materials together some electrons may be transferred from one object to the other. The positive charges cannot be transferred because the protons cant move.
• When a conducting material is rubbed. The charge spreads over the whole of the metal object (the electrons accumulate)
• Electric fields can be positive or negative
• Fields


  • Magnetic
  • Electric
  • Gravitational
• Electric force field diagrams

  • Positive charge
  • Negative charge
• Strength of field


  Stronger where the lines are closer together
• Electrical charge

  Objects can become electrically charged by the transfer of electrons (often due to friction)
• Magnetic fields

  • Some materials generate them naturally
  • It is also possible to "induce" a magnetic field using electrical current