Biomechanics principles

• What is Newton's first law?

  An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
• What is Newton's second law?

  Force = mass x acceleration

  Acceleration is proportional to the size of force applied
• What is Newton's third law?

  For every action there is an equal and opposite reaction force
• What is distance ?

  The total length of a path between two points
• What is displacement ?

  Length of a straight line from joining start to finish
• What is velocity ?

  Rate of change of a position with reference to direction

  Displacement / time
• What is momentum ?

  The product of mass and velocity
• What is acceleration?

  Rate of change of the velocity

  Final velocity - initial velocity / time
• What is force ?

  The push or pull that is internal or external that creates movement
• What is net fore ?

  Resultant force acting on the body when all other forces have been considered
• What is balanced force ?

  0 net force no change in state of movement
• What is a unbalanced force ?

  Forcing acting in one direction on a body is greater than the force opposing it
• What is weight ?

  Gravitational force that exerts an a body pulling it downward
• What is a reaction force ?

  Always a reaction force when to bodies are in contact with each other - Newton's third law
• What is a friction force ?

  Occurs when two bodies are in contact with each other it acts in the opposite direction of motion
• What is air resistance?

  the force that opposes the motion of objects through air
• What is stability ?

  Ability to resist the motion applied
• What is the mass of a body ?

  Greater the mass the more force / inertia needed to displace it
• What happens with a lower centre of mass ?

  The lower the centre of mass the better stability
• What is the base of support ?

  Greater the size of the base of support the greater the stability
• What is the line of gravity ?

  an imaginary vertical line passing through the center of gravity towards the center of the earth and the more central the more stable
• What is centre of mass ?

  Point of hte body is balanced in all direction
• What is the Fosbury flop ?

  A high jump move that allow you to jump higher due to the hyper extension of the back making the CoM outside of the body and below the bar
• Why didn't the straddle jump or the western role allow you to jump as high ?

  The centre of mass was inside the body and above the bar