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# 5 N to the left. – faculty at Chemeketa

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conceptual Physics 11th Edition chapter 2 : NEWTON ’ S FIRST LAW OF MOTION—INERTIA 1

This call on the carpet will help you understand : • • • • • • • •

Aristotle ’ s Ideas of Motion Galileo ’ s Concept of Inertia Newton ’ s First Law of Motion Net Force The Equilibrium Rule Support Force Equilibrium of Moving Things The Moving Earth 2

Aristotle ’ s Ideas of Motion Aristotle ’ sulfur categorization of apparent motion • Natural apparent motion – Every aim in the universe has a proper position determined by a combination of four elements : earth, water, air, and fire. – Any object not in its proper place will strive to get there. Examples : • Stones fall. • Puffs of smoke arise.

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Aristotle ’ s Ideas of Motion • Natural motion ( continued ) – Straight up or straight down for all things on Earth. – Beyond Earth, motion is circular. case : The Sun and Moon continually circle Earth.

• Violent motion – Produced by external pushes or pulls on objects. case : Wind imposes motion on ships. 4

Galileo ’ s Concept of Inertia Galileo demolished Aristotle ’ second assertions in the early on 1500s. Galileo ’ south discovery : • Objects of unlike weight fall to the grind at the same time in the absence of air resistance. • A moving aim needs no force to keep it moving in the absence of friction.

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Galileo ’ s Concept of Inertia Force • is a crusade or a pull.

Inertia • is a place of count to resist changes in motion. • depends on the measure of matter in an object ( its batch ). 6

Newton ’ s First Law of Motion Every object continues in a state of stay or of consistent accelerate in a directly trace unless acted on by a nonzero internet violence.

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Net Force Vector quantity • a quantity whose description requires both order of magnitude ( how much ) and commission ( which means ) • can be represented by arrows drawn to scale, called vectors – length of arrow represents magnitude and arrowhead shows steering Examples : coerce, speed, acceleration

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web force Net coerce is the combination of all forces that change an object ’ mho state of motion. exercise : If you pull on a box with 10 N and a friend pulls oppositely with 5 N, the net military unit is 5 N in the management you are pulling.

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Net Force CHECK YOUR NEIGHBOR A cart is pushed to the right with a pull of 15 N while being pulled to the left with a push of 20 N. The web power on the handcart is A. 5 N to the left. B. 5 N to the justly. C. 25 N to the leave. D. 25 N to the right.

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Net Force CHECK YOUR NEIGHBOR A cart is pushed to the right with a effect of 15 N while being pulled to the leave with a impel of 20 N. The net storm on the cart is A. 5 N to the leave. B. 5 N to the correct. C. 25 N to the left. D. 25 N to the properly.

Two forces are in reverse directions, so they subtract. The direction is determined by the commission of the larger pull.

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Net Force CHECK YOUR NEIGHBOR What is the net force acting on the corner ? A. 15 N to the leave B. 15 N to the veracious C. 5 N to the left D. 5 N to the right

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Net Force CHECK YOUR NEIGHBOR What is the net force out acting on the box ? A. 15 N to the left field B. 15 N to the right C. 5 N to the leave D. 5 N to the right

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The Equilibrium Rule • The vector kernel of forces acting on a nonaccelerating object equals zero. • In equality form : F = 0.

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Support Force Support force ( normal coerce ) is an upward force on an object that is reverse to the military unit of gravity. example : A bible on a postpone compresses Atoms in the table, and the compressed atoms produce the support force.

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Understanding Support Force When you push down on a spring, the leap pushes back up on you. similarly, when a ledger pushes down on a postpone, the mesa pushes back up on the record. 22

Support Force CHECK YOUR NEIGHBOR When you stand on two toilet scales with one infantry on each scale and with your system of weights evenly distributed, each scale will read A. B. C. D.

your weight. half your weight. zero. more than your system of weights.

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Support Force CHECK YOUR NEIGHBOR When you stand on two toilet scales with one foot on each plate and with your weight evenly distributed, each scale will read A. B. C. D.

your weight. half your weight. zero. more than your burden. explanation : • You are at rest, thus F=0. • Forces from both scales add to cancel your system of weights. • violence from each scale is one-half your weight

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Equilibrium of Moving Things Equilibrium : a state of no change with no net force acting – Static chemical equilibrium example : ice hockey puck at rest on slippery ice

– Dynamic chemical equilibrium example : ice hockey puck sliding at constant travel rapidly on slippery ice

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Equilibrium of Moving Things Equilibrium test : whether something undergoes changes in gesture exemplar : A crate at perch is in static balance. case : When pushed at a regular speed, it is in dynamic equilibrium.

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Equilibrium of Moving Things CHECK YOUR NEIGHBOR A bowl ball is in balance when it A. B. C. D.

is at rest. moves steadily in a straight-line way. Both of the above. none of the above.

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Equilibrium of Moving Things CHECK YOUR NEIGHBOR A bowling ball is in balance when it A. B. C. D.

is at pillow. moves steadily in a straight-line way. Both of the above. none of the above.

explanation : equilibrium means no transfer in motion, so there are two options : • If at rest, it continues at rest. • If in motion, it continues at a steadily rate in a straightaway line.

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Equilibrium of Moving Things CHECK YOUR NEIGHBOR You are pushing a crate at a steady travel rapidly in a heterosexual agate line. If the friction force is 75 N, how much push must you apply ? A. B. C. D.

more than 75 N less than 75 N equal to 75 N not enough information

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Equilibrium of Moving Things CHECK YOUR NEIGHBOR You are pushing a crate at a steady focal ratio in a directly production line. If the friction impel is 75 N, how much impel must you apply ? A. B. C. D.

more than 75 N less than 75 N equal to 75 N not enough information explanation : The crate is in dynamic balance, so, F = 0. Your lend oneself effect balances the pull of friction.

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The Moving Earth Copernicus proposed that Earth was moving. • This mind was refuted by people. • model : If Earth moved, how can a dame pounce from a branch to catch a worm ? • solution : As it swoops, due to inertia, it continues to go sideways at the accelerate of Earth along with the tree, worm, etc. 31

The Moving Earth CHECK YOUR NEIGHBOR You are riding in a van at a brace speed and toss a coin up. Where will the coin state ? A. B. C. D.

behind you ahead of you back in your hand There is not enough information.

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The Moving Earth CHECK YOUR NEIGHBOR You are riding in a vanguard at a steady accelerate and toss a coin up. Where will the coin farming ? A. B. C. D.

behind you ahead of you back in your hand There is not enough information. explanation : The coin has inertia. It continues sideways with the van and your hand and lands back in your hand. 33

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