vector and scalar quantities

• what does scalar have

  magnitude only
• what does vector have

  magnitude and direction
• how can a vector quantity be represented

  by an arrow
• what does length of an arrow represent

  magnitude
• what does direction of arrow represent

  direction
• what is centre of mass

  single point where weight is said to act
• what is the resultant force

  sum of all forces in all directions acting on an object