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Transcript
Newton’s Laws of Motion Law of Inertia • Newton’s first law of motion – the law that states that an object will maintain its current state of motion unless it is acted FN upon by an unbalanced force v • Also called the law of inertia FA FF • Inertia – a property of matter that describes an object’s tendency to resist a change in motion • Mass – a measurement of the quantity of matter also related to inertia Fg • Law of inertia applies to both objects at rest and in motion • Ex) The net force on the book is zero so it moves with a constant velocity Force & Acceleration • Newton’s second law of motion – the law that states that the acceleration of an object is directly related to the net force on the object and inversely related to the mass of the object net force = mass acceleration 𝐹!"# = 𝑚𝑎 • Units of newtons can be broken down N = kg ∙ m s! Force Pairs • Newton’s third law of motion – the law that states that for every action there is an equal and opposite reaction • Force pair – a pair of equal and opposite forces applied between two objects • Ex) Three force pairs between the mass, Earth, string, and ceiling 𝐹!"#$#%& !" !"#$%& = −𝐹!"#$%& !" !"#$#%& 𝐹!"#$%& !" !"## = −𝐹!"## !" !"#$%& 𝐹!"## !" !"#$% = −𝐹!"#$% !" !"## Physics 3.2 – Newton’s Laws of Motion