physics grade 11 term 1

• scalar


  A physical quantity that has only magnitude.
• vector 


  A physical quantity that has magnitude and direction.
• Any vector can be represented by an arrow :

  The length of the arrow represents the magnitude of the vector, the arrowhead shows the direction of the vector and the end of a line
• a force 


  a pull or a push
• Non-contact force 


  Acts over a distance , for example magnetic force ,electrostatic force and gravitational force
• Contact force 


  objects are in contact with each other
• When a body remains in rest or moves at a constant velocity OR if there is no net force exerted on the body
• RESULTANT VECTOR

  The resultant vector is the vector sum of all the vectors acting on the object. It is one vector that has the same effect as all the vectors acting on the object simultaneously.
• NEWTON'S FIRST LAW OF MOTION

  An object will remain at rest or motion at constant velocity, unless acted upon by an external net (resultant) force.
• INERTIA

  Inertia is the resistance of an object to a change in its state of motion or rest.
• ACCELERATION

  Acceleration is the rate of change of velocity of an object.
• NEWTON'S SECOND LAW OF MOTION

  If a net (resultant) force acts on an object, the object will accelerate in the direction of the net force. The acceleration is directly proportional to the net force and inversely proportional to the mass of the object.
• NEWTON AS THE UNIT OF FORCE

  One newton is the force that accelerates a mass of 1 kg at 1 m:s? in the direction of the force

  1N = 1 kg-m-s-2
• NEWTON'S THIRD LAW OF MOTION

  If object A exerts a force on object B, object B simultaneously exerts an oppositely directed force of equal magnitude.
• LAW OF UNIVERSAL GRAVITATION

  A force of gravitational attraction exists between any two objects in the universe that have mass.

  This force of attraction is directly proportional to the product of the masses of the objects and inversely proportional to the squared distance between their centres of gravity.
• Liver

  Manufactures bile, deaminates amino acids, metabolise glucose and breaks down alcohol, drugs and hormones. Stores vitamins ADEK and B12
• Gall bladder

  Stores bile until it is released in the small intestine
• Large intestine/Colon

  Absorbs water and forms feaces
• Anus

  Faeces released from body during egestion/defecation
• Human diagram

  DIagram

  A) P

  B) l

  C)

  D)

  E)

  F)

  G)

  H)

  I)