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Newtons’ 1 st Law. Principles of Physics - Foederer. Matter. has. has. is . has units of . is a measure of. Definition: . is . has units of . Definition: . Volume. Mass. Amount of space something occupies. kg. Inertia. Resistance to changes in motion. c m 3 , liters. Inertia

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## Newtons’ 1 st Law

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**Newtons’ 1st Law**Principles of Physics - Foederer**Matter**has has is has units of is a measure of Definition: is has units of Definition: Volume Mass Amount of space something occupies kg Inertia Resistance to changes in motion cm3, liters**Inertia**• is a property of matter • is mass • is measured in kg • is not dependent on the motion of the object • As mass increases, inertia increases • As mass decreases, inertia decreases**Newton’s 1st Law**Newton’s Laws help explain and predict the workings of the mechanical world. Newton’s 1st Law (N1L) – a.k.a. Law of Inertia A force is required to change the motion of an object**Newton’s 1st Law**A change in motion could be: • speeding up • slowing down • stopping • starting • changing direction These are all examples of acceleration**Newton’s 1st Law**• Objects will continue moving in straight paths at the same speed unless acted upon • In real world we don’t see this because of friction (a force that opposes motion) • Objects at rest will not move unless forced**According to N1L, a change in motion will only occur when a**force causes it If no change in motion then either: 1. no forces are acting on it or 2. all forces cancel each other out (Fnet = 0)**F2**F1 When all forces cancel each other out Fnet = 0 Example Fnet = F1 – F2 = 0 **This object may be motionless or moving with constant speed (speed is unchanging).

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