Newton's first law of motion

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Intros
Lessons
  1. Introduction to Newton's first law
  2. What is Newton's first law?
  3. What is inertia?
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Examples
Lessons
  1. Explain physical observations using Newton's first law and inertia

    Explain using Newton's 1st1^{st} Law or inertia:

    1. True or false: a vase sitting still on a desk has no horizontal forces acting on it. Explain your answer.
    2. Why do you press against your seatbelt when you are in a car that stops suddenly?
    3. A shopping cart is pushed at a constant velocity of 1.5 m/s with a force of 40 N. What is the net force acting on the cart?