forces & interactions

• scalars


  -quantities that only have magnitude

  eg

  *distance

  *speed

  *mass
• vectors

  -quantaties that have magnitude and direction

  eg

  *displacement

  *velocity

  *weight
• vectors are represented by arrows

  -length of arrow is magnitude of vector

  -direction of arrow is direction of vector
• force

  -push or pull that acts on object due to interaction with another object

  2 types of forces:

  *contact

  *non-contact
• forces can effect body by:

  -changing their speed

  -changing their direction

  -changing their shape
• contact forces

  -force that acts between physically touching objects

  eg

  *friction force: opposes motion, occurs when objects rub against eachother

  *air resistance: type of friction occuring when object moves through air

  *tension: force that pulls 2 objects connected by length(eg rope),occurs when force is applied 2 length