Newton’s Laws of Motion. Chapter 19 Forces Section 3 pg 739 Section 4 pg 743. Isaac Newton “The force was with him". Born & studied in England One of the most influential scientists of all time His discoveries of forces led to his credit of the Newton. Outline of Today’s Lesson.
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Newton’s Laws of Motion
Chapter 19 Forces
Section 3 pg 739
Section 4 pg 743
Main Idea: Newton’s Laws of Motion
Part I: If an object is moving, then it will continue to move until a force stops it.
Part II: If an object is at rest, then it will remain at rest until a force moves it.
The more mass an object has the harder it will be to move or keep still.
The opposite is true: If an object has less mass, then it will be easier to move or keep still.
*The more mass an object has, the more inertia it will have
*The less mass an object has, the less inertia it will have
Remember objects with more mass are always harder to keep still or keep moving! This affects how much inertia an object has.
Net Force = Mass X Acceleration
Let’s test out this formula…
Ex 1: What is the net force on a 1,000 kg object accelerating at 3 m/s2?
1: What formula will you use? NF = M X A
2: Plug in the values. NF = (1,000kg)(3 m/s2)
3: Solve! Net Force = 3,000 Newtons
Formula: Acceleration = NF / Mass
Plug in values A = 75 N / 25 kg
Divide and your answer is A = 3 m/s2
“ Newton’s Third Law of Motion states that if one object exerts a force on another object, then the second object exerts a force of equal strength in the opposite direction on the first object.”