forces acting on performer during linear motion

• weight is a gravitational force that pulls the body towards the earth
• greater mass = greater weight force
• static friction

  force exerted on one surface by another when there is no motion between both surfaces
• sliding friction

  • two bodies in contact with each other that are both in motion
  • friction both act in opposite motions
• 3 things friction is affected by?

  1. temperature of both surfaces: higher temp = less friction
  2. mass of objects sliding: larger mass = greater friction
  3. characteristics of both surfaces
• what is air resistance?

  force that acts in opposite direction to motion of a body travelling through air
• 3 things air resistance is dependent on.

  1. velocity of moving body
  2. cross-sectional area of moving body
  3. shape/surface characteristics of moving body
• reaction force

  for every force acting on performer there is a reaction force in opposite direction
• what law does reaction force relate to?

  newtons 3rd law