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Review: Newtons second Law or Solving Problems: (1)Isolate the object of interest (2)Sketch forces acting on object – indentify all the external forces acting on an object. (3) Choose coordinate system (x &y) (4) Resolve into components Apply 2 nd law to each components. In components

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m=2kg Ex. m=2kg Find the acceleration

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5-4 Newtons third law of motion force hand exerts on box force box exerts on hand

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Canoe Problem 1 2 m 1 =150kg m 2 =250kg 46N Ex. 2 boxes 10kg & 5kg, both are pushed in +x direction with a force of 20N, what is the force of contact? 20N 10kg 5kg F 12 F 21 (a) Find acceleration of each canoe? (b) what is the separation of canoes after 1.2 s?

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5-5 The Vector Nature of Forces: Forces in Two Dimensions θ Review: F 1x= F 1 cosθ F 2x =F 2 F 1y =F 1 sinθ F 2y =0

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Ex. Say dog 1 wants to go 32 0 north of east 12N, and dog 2 goes east 16N. Find magnitude and direction of accelerate? F 2 =16N x m=2kg F 1 =12N y

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5-6 Weight Weight: force exerted on object by gravitational pull of earth. y a y =g W=mg Unit: N

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Ex. 81 kg person has a weight ? Ex. What is the acceleration of the mass? F=200N 8kg

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5-7 Normal forces Normal force: ; force exerted by table on object y

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Problem: (a)What is the normal force exerted on the mass? (b)Find the acceleration of the mass? 30 0 8N 10kg

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Ice Block Ex 5-8 F 1 =13N; F 2 =11N; m=6kg (a)Find the acceleration of ice box? (b)Find the normal force? 30 0 60 0 F2F2 F1F1

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Apparent weight m=80kg what is the reading on the scale of elevator is going up at 3.2 m/s 2

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Ex. Sliding down an incline, mass m, (neglect friction), find acceleration and normal force? N W α y x

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Classical Mechanics Describes the relationship between the motion of objects in our everyday world and the forces acting on them Conditions when Classical.

Classical Mechanics Describes the relationship between the motion of objects in our everyday world and the forces acting on them Conditions when Classical.

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