Unit 2 – Dynamics (Forces)

• Dynamics is concerned with...

  Motion of objects and why they move
• An interaction between two objects?

  Force
• Forces are...

  Pushing and Pulling
• The unit of forces is...

  Newton or N
• Force is a...


  Vector
• The force of gravity acting on an object...

  Weight (Fg)
• The amount of matter in an object...

  Mass
• A measure of how hard it is to change what an object is doing...

  Inertia
• The force applied on an object by a surface perpendicular to the surface...

  Normal Force
• Is caused by 2 surfaces in contact with each other and is a force between the surfaces that opposes motion (or attempted motion)...


  Friction
• Static Friction


  Not moving
• Kinetic Friction


  Moving
• fs > fk
• The amount of friction over the normal force

  Coefficient of Friction
• The force applied by, or to, a rope, string, chain, thread, etc.

  Tension