Biomechanics surgery

1
Biomechanics surgery

• What have we learnt so far?
• Can you and your partner define the following?
• Speed, acceleration, momentum, impulse, friction,
  drag, angular momentum

2
Mass and weight

• Mass and weight are different
• Mass is the total amount of matter in a body
• Weight is the force due to gravity on a mass-
  towards the centre of the earth
• If the mass of a sprinter is 50kg then their
  weight would be 50 x 10 500 newtons
• On the moon where the gravitational pull is only
  1.67 newtons per kg what would their weight be?

3
Distance and displacement

• Distance is the total distance that a body
  travels measured in meters
• But displacement is the shortest distance between
  the start and the finish
• Draw a diagram to illustrate this
• In which sport is distance 400m but diplacement
  0m?

4
Vectors and scalars

• Quantities are either vectors or scalars
• Scalars have magnitude- in other words you know
  how big they are.
• Vectors have magnitude and direction
• Are weight and mass vectors or scalars?
• What about distance and displacement?