FORCES

FORCES

1. can be

   • balanced
     • the object doesn't move
   • unbalanced
     • the object moves
   • non-contact
   • contact

2. can make an object

   • start moving
   • speed up
   • slow down
   • change direction
   • stop
   • change the shape
   • break

3. CONTACT FORCES

   • touching
   • UPTHRUST
     • applied by water and air
     • push force
     • small mass and big volume -> lot of upthrust
       • float in water
     • large mass and small volume -> less upthrust
       • sink in water
     • Upthrust = Weight
       • FLOAT

4. NON-CONTACT FORCES

   • without touching
   • GRAVITY
     • a pull force towards the centre of objects
     • Weight
       • Mass X gravity
   • MAGNETISM
     • push or pull force
     • attract objects made of iron and steel
     • Magnets have two ends
       • north pole
       • south pole
       • opposite poles: attract
       • same poles: repel