# Lesson 3 Reading Guide - Vocab inertia Newtonâ€™s first law of motion Newtonâ€™s second law of motion Newtonâ€™s third law of motion force pair Newtonâ€™s Laws

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Lesson 3 Reading Guide - Vocab

Lesson 3 Reading Guide - VocabinertiaNewtons first law of motionNewtons second law of motionNewtons third law of motionforce pairNewtons Laws of Motion1Lesson 3-1A.Newtons Laws1.Forces are measured in newtons (N).2.Isaac Newton studied the motion of objects and summarized his findings in three lawsNewtons Laws

2Lesson 3-2B.Newtons First Law1.Inertia is the tendency of an object to resist a change in its motion.Newtons First LawinertiaScience Use the tendency to resist a change in motionCommon Use lack of action

3Lesson 3-22.Newtons first law of motion states that if the net force acting on an object is zero, the motion of the object doesnot change.3.Sometimes Newtons first law of motion is called the law of inertia.Newtons First Law (cont.)4Lesson 3-24.Newtons first law explains the effect of balanced forces on an object.a.If balanced forces act on an object at rest, the object remains at rest.b.If balanced forces act on a moving object, the object continues to move at the same velocity.Newtons First Law (cont.)55.The motion of an object changes only when a(n) net force acts on it according to Newtons first law.a.Unbalanced forces can cause an object to accelerate, or speed up.b.They also can cause an object to decelerate, or slow down.c.They also can cause acceleration by causing the object to change direction.

Lesson 3-3C.Newtons Second Law of Motion1.Newtons second law of motion states that the acceleration of an object equals the force exerted on the object divided by the mass of the object.Newtons Second Law of Motion

7Lesson 3-32.Newtons second law explains the relationship among force, mass,and acceleration.Newtons second law lets you predict what combination of force and mass you need to get the acceleration you need.Newtons Second Law of Motion (cont.)8Lesson 3-4D.Newtons Third Law1.Newtons third law states that when one object exerts a(n) force on a second object, the second object exerts a force of the same size but in the oppositedirection on the first object.a.The initial force is called the action force.b.The force exerted in response is called the reaction force.9Lesson 3-42.When two objects exert forces on each other, the two forces are a(n) force pair.a.Each force in a force pair acts on a(n) different object.b.Newtons laws work together.Newtons Third Law (cont.)10Lesson 3-5E.Newtons Laws in Action1.Newtons laws do not apply to very small objects, such as atoms.2.They also do not apply to objects whose motion approaches the speed of light.Newtons Laws in Action11Lesson 3-5Newtons Laws in Action (cont.)

DEX IMAGE/Getty ImagesMasterfile12

Lesson 3 - VSNewtons first law of motion states that the motion of an object remains constant unless acted on by an outside force. This also is called the law of inertia.13

Lesson 3 - VSNewtons second law of motion relates an objects acceleration to its mass and the net force applied to the object.14

Lesson 3 - VSNewtons third law of motion states that for every action force, there is an equal but opposite reaction force. The two forces are called a force pair.15Lesson 3 LR1

When balanced forces act on an object, the object is either moving with a constant velocity or _____.A.speeding up B.slowing downC.changing direction D.at rest16Lesson 3 LR2

A.the direction of the action forceB.the direction of the inertiaC.the direction of the net forceD.the direction of reaction forceAccording to Newtons second law of motion, the direction of acceleration is the same as which direction?17Lesson 3 LR3

A.Newtons first law of motionB.Newtons second law of motionC.Newtons third law of motionD.a force pairWhich is also known as the law of inertia?18Lesson 3 - Now

5.All forces change the motion of objects.6.The net force on an object is equal to the mass of the object times the acceleration of the object.Do you agree or disagree?19

Chapter Review MenuKey Concept SummaryInteractive Concept MapChapter ReviewStandardized Test Practice

20The BIG IdeaForces are pushes and pulls that may change the motion of an object. Balanced forces result in an object remaining at rest or moving at a constant speed. Unbalanced forces result in the acceleration of an object.

21Key Concepts 1An objects motion depends on how it changes position. Motion can be described using speed, velocity, or acceleration.Speed is how fast an object moves. Velocity describes an objects speed and the direction it moves. Acceleration describes the rate at which an objects velocity changes.A graph can show you how either the displacement or the speed of an object changes over time.Lesson 1: Describing Motion

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Key Concepts 2Lesson 2: ForcesA force is a push or pull on an object. Contact forces include friction and applied forces. Noncontact forces include gravity, electricity, and magnetism.Gravity is a force of attraction between any two objects. Gravitational force increases as the masses of the objects increase and decreases as the distance between the objects increases.Balanced forces acting on an object cause no change in the motion of the object. When unbalanced forces act on an object, the sum of the forces is not equal to zero. Unbalanced forces cause acceleration.23Key Concepts 3Inertia is the tendency of an object to resist a change of motion Newtons first law of motion states that an object will remain at rest or in constant straight-line motion unless unbalanced forces act on the object.Newtons second law of motion states that the acceleration of an object increases as the force acting on it increases and decreases as the mass of the object increases.Newtons third law of motion states that for every action force, there is an equal but opposite reaction force. The action-reaction forces are called a force pair.Lesson 3: Newtons Laws of Motion24

Chapter Review MC1A.accelerationB.reference point C.speed D.velocity

To describe motion you need both direction and what?25

Chapter Review MC2A.accelerationB.displacementC.speedD.velocity Which describes the distance an object moves divided by the time it took to move that distance?26

Chapter Review MC3A.contact forceB.frictionC.net forceD.noncontact force Which term refers to a push or a pull applied by one object to another object that is touching it?27

Chapter Review MC4A.frictionB.gravity C.inertiaD.massWhich is a contact force that resists the sliding motion between two objects that are touching?28

Chapter Review MC5A.force pairB.gravity C.inertia D.unbalanced forcesWhich term describes the tendency of an object to resist a change in motion?29

Chapter Review STP1

A.inertiaB.massC.motionD.weightWhich changes when an unbalanced force acts on an object?30

Chapter Review STP2A.acceleration B.displacementC.distanceD.velocity Which is the speed and direction of an objects motion?31

Chapter Review STP3A.You pedal to speed up.B.You turn at constant speed. C.You coast to slow down. D.You pedal at constant speed.You are riding a bike. In which situation are the forces acting on the bike balanced?32

Chapter Review STP4A.frictionB.gravity C.inertiaD.net forceWhich is a noncontact force that exists between all objects that have mass?33

Chapter Review STP5A.action forceB.force pairC.inertia D.reaction force When two objects exert forces on each other, the two forces are called what?

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