# Chapter 4 edited.pptx - Chapter 4 u2022 Forces and...

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Chapter 4Forces and Newton’s Laws of Motion
4.1 The Concepts of Force and MassA forceis a push or a pull.Contact forces arise from physicalcontact .Action-at-a-distance forces do notrequire contact and include gravity and electrical forces.
4.1 The Concepts of Force and MassArrows are used to represent forces. The length of the arrowis proportional to the magnitude of the force. 15 N5 N
4.1 The Concepts of Force and MassMass is a measure of the amount of “stuff” contained in an object.
4.2 Newton’s First Law of Motion
Newton’s First Law
Newton’s First Law
What does this mean?
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What is meant by unbalanced force?
4.2 Newton’s First Law of MotionThe net force on an object is the vector sum of all forces acting on that object.The SI unit of force is the Newton (N).Individual ForcesNet Force10 N4 N6 N
4.2 Newton’s First Law of MotionIndividual ForcesNet Force3 N4 N5 N64
4.2 Newton’s First Law of MotionInertia is the natural tendency of anobject to remain at rest in motion ata constant speed along a straight line.The massof an object is a quantitativemeasure of inertia.SI Unit of Mass: kilogram (kg)
4.2 Newton’s First Law of MotionAn inertial reference frame is one in which Newton’s law of inertia is valid.All accelerating reference frames arenoninertial.