FootholdPrinciples_Exam2

FootholdPrinciples_Exam2 - 1 Conceptual ideas underlying...

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3/22/15 1 Conceptual ideas underlying Newton’s Laws: 1 Objects respond only to inﬂuences [email protected] upon them at the instant that those inﬂuences act. ( Object ego*sm ) All outside effects on an object being equal, the object maintains its velocity (including [email protected]). The velocity could be zero, which would mean the object is at rest. ( Iner*a ) Every change in velocity an object experiences is caused by the object [email protected] with some other object – forces. ( Interac*ons ) Conceptual ideas underlying Newton’s Laws: 2 If there are a lot of different objects that are [email protected] with the object we are considering, the overall result is the same as if we add up all the forces as vectors and produce a single [email protected] force -­‐-­‐ the net force . ( Superposi*on ) When one object exerts a force on another, that force is shared over all parts of the structure of the object. ( Mass ) Whenever two objects interact, they exert forces on each other. ( Reciprocity ) Foothold principles: Newton s Laws a A = F A net m A F A B type = F B A type Newton 0: An object responds only to the forces it feels and only at the instant it feels them. Newton 1: An object that feels a net force of 0 keeps moving with the same velocity (which may = 0). Newton 2: An object that is acted upon by other objects changes its velocity according to the rule Newton 3: When two objects interact the forces they exert on each other are equal and opposite. Foothold ideas: [email protected] forces [email protected] forces are contact forces [email protected] between two touching surfaces that are parallel to the surface and tend to oppose the surfaces from sliding over each other. How they behave depends on the [email protected] materials.

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