newton s second law of motion l.
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Newton’s Second Law of Motion. Forces: Recap. Force: a push or a pull on an object; the result of an interaction between two objects Units: newtons (N) Types of forces: Gravity (F grav ) Friction (F fric ) Tension (F ten ) Normal Force (F norm ) Applied Force (F app )

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Presentation Transcript
forces recap
Forces: Recap
  • Force: a push or a pull on an object; the result of an interaction between two objects
  • Units: newtons (N)
  • Types of forces:
    • Gravity (Fgrav)
    • Friction (Ffric)
    • Tension (Ften)
    • Normal Force (Fnorm)
    • Applied Force (Fapp)
  • Force is a vector quantity. Multiple forces acting on an object produce a net force.
free body diagrams
Free Body Diagrams
  • Standard representation of therelative magnitude and directionof all forces acting upon an object.
  • Object represented by a box, forces by arrows
  • Size of the arrow reflects magnitude of force
  • Direction of the arrow shows force direction
  • Each arrow is labeled to indicate the force type
  • Arrows are always drawn outward from the box
  • Must depict all the forces which act on the object

Check out www.physicsclassroom.com for a bunch of great examples!

net force
Net Force
  • Vector sum of all forces acting on the object
  • Vector addition considers different directions
    • Same direction: add
    • Opposite direction: subtract
    • What about at right angles?
    • What about at obtuse or acute angles?

Check out www.physicsclassroom.com for a bunch of great examples!

net force5
Net Force
  • The net force is known for each situation below.
  • However, the magnitudes of a few of the individual forces are not known.
  • Analyze each situation individually and determine the magnitude of the unknown forces.
recall newton s first law of motion
Recall: Newton’s First Law of Motion
  • An object at rest will remain at rest andan object in motion will remain in motion at a constant velocity,unless it is acted on by unbalanced forces
  • This tendency increases as mass increases
  • So, basically…velocity doesn’t change without a net force
newton s second law of motion7
Newton’s Second Law of Motion
  • The acceleration of a body is directly proportional to the net force acting on the body and inversely proportional to the mass of the body.

Consider this: 1 N = 1 kg·m/s2 Does that make sense?