FC

Unit 3

  • Force - a push or pull one thing exerts on another

    • examples of force - gravity, magnetism, air, friction

  • Friction - the resistance that one surface or object encounters when moving over another

  • Fnet - the sum of all forces that act on an object

  • inertia - the momentum that is resistant to change in an object

  • equilibrium - where all forces acting on an object are balanced, resulting in no net force

  • mass vs. weight - mass is determined by the amount of matter an object has, and weight is determined by the amount of matter and the force of gravity acting upon it

Formulas

  • 1 Newton = 1 kg x 1 m/s2

  • First Law of Motion - Fnet = 0

  • Second Law of Motion - Fnet= m x ā

  • weight of an object - Fg = mg

Newton’s Laws of Motion

  1. if fnet=0, then the object is at rest or moving with a constant velocity and is at equilibrium

  2. net force and acceleration are directly related

  3. -

Acceleration

  • acceleration is positive at all times during calculations

  • when acceleration is pointing downwards - Fr < Fg

  • when acceleration is pointing downwards - Fr > Fg

Normal Force

  • Normal force - a force exerted by the surface an object is on that is perpendicular to the surface

  • Normal force and the force of gravity cancel each other

Movement at an Incline

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