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Newton's First Law

Newton's First Law. An object at rest remains at rest, and an object in motion remains in motion, unless acted upon by an external unbalanced force!. Inertia. Inertia: the resistance an object has to a change in its state of motion. Experiment. Pg. 31.

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Newton's First Law

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  1. Newton's First Law An object at rest remains at rest, and an object in motion remains in motion, unless acted upon by an external unbalanced force!

  2. Inertia • Inertia: the resistance an object has to a change in its state of motion.

  3. Experiment • Pg. 31. • Before you start: write down your prediction of what will happen when you change the velocity variable in the relationship between the distance an unrestrained occupant travels and velocity. • Re-create and complete chart on Pg. 31. • Hand in at end of class.

  4. Conclusions • Relationship between the distance an unrestrained occupant is “thrown” and the velocity of a car is called an exponential relationship. • Means as one variable increases, the other increases at a faster rate. • distance travelled (of an unrestrained passenger) is proportional to velocity squared • (d ∝ v2).

  5. ex.) If a passenger is thrown 4 m at 20 km/h, then at 80 km/h, 4x the velocity, passenger thrown 4(4)2=4(16) = 64m • If speed DBLs, distance increases by 4 times. • If speed triples, distance increases by 9 times

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