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Newton’s Second Law of motion (牛頓運動第二定律)

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Presentation on theme: "Newton’s Second Law of motion (牛頓運動第二定律)"— Presentation transcript:

1 Newton’s Second Law of motion (牛頓運動第二定律)
Ch.8 Newton’s Second Law of motion (牛頓運動第二定律)

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5 100 N 200 N 100 N N = 300 N Left 5

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7 300 N 400 N 300 N N = 700 N North 7

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9 100 N 250 N -100 N N = 150 N Right 9

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11 500 N 300 N 500 N N = 200 N South 11

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13 200 N 300 N 500 N 500 N N – 200 N = 0 no direction

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15 Newton’s 2nd Law of Motion

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17 F = 100 N

18 F = 100 N a = F  m = 100  20 = 5 m s-2

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20 F = 100 – 40 = 60 N

21 F = 100 – 40 = 60 N a = F  m = 60  20 = 3 m s-2

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23 Thrust = Drag Lift = Weight It is because the aeroplane is moving at constant velocity means acceleration = 0 , i.e. the resultant force = 0.

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25 Thrust > Drag It is because a resultant force in forward direction is acting on the aeroplane.

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28 R F = 0 R = W = 650 N W

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30 F = ma = (65) (2) = 130 N R’ – W = ma R’ = W + ma = 650 + 130 = 780 N

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32 F = ma = (65) (-2) = -130 N R” – W = ma R” = W + ma = 650 + (-130)

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34 F = 0 It is because the trolley is moving with constant velocity means acceleration = 0. (friction = 100 N)

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36 F = 200 N

37 F = 200 N a = F  m = 200  25 = 9 m s-2

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39 F = 200 – 100 – 100 (friction = 100 N) = 0  a = F  m = 0 200 N


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