quantities and forces

• describe scalar quantity 


  only magnitude
• give examples of scalar quantities 


  speed, direction, mass, temperature and time
• describe vector quantities 


  magnitude and direction
• give examples of vector quantities

  force, velocity, acceleration, displacement and momentum
• describe force 


  push or pull that acts on object due to interaction with another object
• describe contact force 


  objects are physically touching
• give examples of contact forces

  normal, friction, resistance and tension
• describe non contact force

  objects not physically touching
• give examples of non contact forces

  gravitational, magnetic and electrostatic
• describe resultant force 


  overall force acting on an object
• describe elastic deformation


  return to original shape when forces removed
• describe inelastic deformation


  does not return to original shape when forces removed
• describe relationship of extension and force applied

  extension directly proportional to force applied