Laws of Motion

Newton’s Law of Motion

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First Law: the law of inertia: any object at rest tends to stay at rest unless acted upon by an outside force, and any object in motion tends to stay in motion unless acted upon by an outside force.

  1. Learn the vocabulary: friction, gravity, inertia, balanced forces, unbalanced forces
  2. Memorize: friction slows down moving objects, force is a push or pull
  3. Watch videos: Sir Isaac Newton,   First Law of Motion
  4. Try an experiment that shows centripetal force acting on an object: Pitcher and Ball
  5. Try some more experiments:  Balls, Coins and Inertia

Second Law: an unbalanced force changes an object’s motion; the greater the mass of an object, the greater the force needed to increase the acceleration of the object.

  1. Learn the vocabulary: acceleration, gravity, mass, air resistance, Newtons
  2. Memorize: force = mass x acceleration; weight measures the force of gravity on an object; mass measures how much matter in in an object
  3. Watch a video: Gravity, Force of Attraction,

Third Law: for every action force, there is an equal and opposite reaction force

  1. Learn the vocabulary: action- at-a-distance force, contact force, air resistance, magnetism
  2. Memorize: forces act in pairs
  3. Watch a video: Why a Boat Floats
  4. Watch a video: Why a Kayak Floats
  5. Try an experiment: Balloon and Straw


  1. Watch a video quiz: Identify the Law
  2. Complete a review sheet: Forces and Newton’s Laws of Motion


  1. Build a chair of newspaper
  2. Properly write up your experiments: Criteria for a Science Experiment
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