Science

• Speed


  Distance / Time
• Speed is usually in mls
• Forces


  • Friction
  • Surface tension
  • Upthrust
  • Gravity
  • Magnetism
  • Air resistance
• Friction


  Resists the motion of objects rubbing against each other (contact force)
• Surface tension


  When a thin film forms on the surface of a liquid that makes it act all stretchy (contact force)
• Upthrust


  The force that pushes objects up when submerged in fluid
• Gravity


  The contact force by which a planet or other body draws objects to its centre
• Magnetism


  Attraction or repulsion which arises between electrically charged particles (contact force)
• Air resistance


  Drag, what friction in the air is pushing against you
• Lubricant


  Reduces friction
• Streamlined


  Something made to have little air resistance
• Thrust


  The force that pushes an object forward
• No friction means objects never stop
• The ball will move down if the force is greater than 45N
• The ball will not move if the force is less than 45N
• Moment (Nm)


  Force (N) x distance from pivot
• Terminal velocity


  Maximum velocity of an object when it falls, occurs when drag and gravity are equal
• Substances


  • Elements
  • Compounds
• All substances are made of atoms
• Elements are made up of one type of atom
• Compound


  Made up of 2 or more different elements that are chemically combined
• If two of the same elements combine, the name doesn't change (e.g. O2 - oxygen)
• A compound is made up of 2 or more different elements that are chemically combined
• H2O is a compound made of hydrogen and oxygen
• Periodic table


  • Metals
  • Non-metals
• Digestive system


  • Mouth
  • Esophagus
  • Stomach
  • Small intestine
  • Large intestine
  • Anus
• Starch test

  Add iodine, turns orange-brown if positive
• Sugar test

  Add Benedict's, turns blue if negative, orange-red if positive
• Protein test

  Add biuret, turns purple if positive
• Enzymes

  Biological catalysts that speed up chemical reactions