newton’s laws physical science. 10/15 obj: to review 1 st law and begin 2 nd law hw – solve...
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Newton’s LawsPhysical Science
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10/15 Obj: To review 1st Law and begin 2nd
LawHW – Solve Problems
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Newton’s 1st LawState the law
and draw a picture or pictures demonstrating your
understanding of the law.
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Sir Isaac Newton• 1643-1727
• Lived & worked in England
• Made major developments in physics, mathematics, religion, geography, chemistry & optical science
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“If I have been able to see further, it was only because I stood on
the shoulders of giants.” —Sir Isaac Newton
Sir Newton was born the year that Galileo died
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Newton’s Laws• Newton developed three laws that govern all
motion.
• They are named Newton’s 1st,2nd, & 3rd laws.
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The Law of Inertia(Newton’s 1st Law)
• Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it.
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The Law of Inertia(Newton’s 1st Law)
• to dislodge ketchup from the bottom of a ketchup bottle, the bottle is often turned upside down, thrust downward at a high speed and then abruptly halted.
• headrests are placed in cars to prevent whiplash injuries during rear-end collisions.
• while riding a skateboard (or wagon or bicycle), you fly forward off the board when hitting a curb, a rock or another object which abruptly halts the motion of the skateboard.
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Inertia• Inertia is an object’s resistance to change
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Inertia
• Inertia is an object’s resistance to change
http://www.lhup.edu/gp/PhysicsClub/demo_f00_eggdrop_2_movie.mov
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A note about FORCE• A force is a push or pull upon an object
resulting from the object's interaction with another object.
• Force is measured in NEWTONS (N)
• 1 Newton = 1kg * 1m/s2
• FORCE is like velocity, it has a size AND direction and can be added the same way
• The NET FORCE or FNET = total of all forces
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Newtons
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Newton’s 2nd Law• Objects will only accelerate if they are acted
upon by an unbalanced force
• This is shown by:
Fnet = m * a
m
F
a
F=Force
M=mass
A=acceleration
a=f÷m
m=f÷a
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Newton’s 2nd Law• How much net force is required to
accelerate a 1000 kg car at 5.00 m/s2?
F = m * aF = 1000kg * 5.00m/s2
F = 5000N
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Newton’s 2nd Law• What is the mass of an object that is
accelerated to 20m/s2 by 100N?
m = F / am = 100N / 20m/s2
m = 5kg
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Newton’s 2nd Law
Because this triple-beam balance scale measures
the mass (not the weight) of an object, it will read the same on any planet.
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Newton’s 2nd Law• Is an unbalanced force acting on this car?
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Newton’s 2nd Law – a version• MASS is how much there is of the object
• WEIGHT is the force required to support an object against the pull of gravity
Weight = mass * gravityw = m*g
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Newton’s 2nd Law• How much does a 25kg child weigh?
w = m * gw = 25kg * 10m/s2
w = 250N
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Newton’s Second Law
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Newton’s 3rd Law
"For every action, there is an equal and opposite reaction."
Forces always come in pairs - equal and opposite action-reaction force pairs.
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Newton’s 3rd Law
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Newton’s 3rd Law
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A cyclist traveled at 12 km/h for 5 hours. How far did he travel?