physics 1

• Soft iron can be easily magnetised and demagnetised
• 3 ways of increasing the strength of an electromagnet


  • More coils on the iron nail
  • Turning up the voltage
  • Putting it in the coils
• Soft iron can be easily temporarily magnetised
• What happens when the button is pushed

  1. Circuit complete

  2. Electricity flows

  3. Electromagnet turned on

  4. Iron bar attracted to electromagnet
• Cobalt, iron, steel, nickel are magnetic
• The arrows are pointing to the nearest south pole
• Always leave mass in kg and height in metres
• formula to get mass when potential energy is involved

  PE /g x h =m
• Formula to get height when potential energy is involved

  PE/m x g=h
• formula for potential energy 


  PE=mgh
• kinetic energy formula

  ke= 1/2 mv²
• formula for an object falling down

  1/2 x PE/V²