Gravity, is it contact or non contact force?, Magnetism, is it contact or non contact force?, Friction, is it contact or non contact force?, Define contact force, Define non contact force, Who talked about friction Aristotle or Galilie ?, What is inertia?, What is acceleration?, Define Newton's first law, Define Newton's second law, Define Newton's third law, when the two forces are not equal, they are unbalanced ( true/ false), when the two forces are equal they are ( balanced / unbalanced)

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