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UNIT 4 Forces and the Laws of Motion

UNIT 4 Forces and the Laws of Motion. ConcepTest 5.1a Gravity and Weight I. 1) F g is greater on the feather 2) F g is greater on the stone 3) F g is zero on both due to vacuum 4) F g is equal on both always 5) F g is zero on both always.

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UNIT 4 Forces and the Laws of Motion

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  1. UNIT 4Forces and the Laws of Motion

  2. ConcepTest 5.1aGravity and Weight I 1) Fg is greater on the feather 2) Fg is greater on the stone 3) Fg is zero on both due to vacuum 4) Fg is equal on both always 5) Fg is zero on both always What can you say about the force of gravity Fg acting on a stone and a feather?

  3. ConcepTest 5.1aGravity and Weight I 1) Fg is greater on the feather 2) Fg is greater on the stone 3) Fg is zero on both due to vacuum 4) Fg is equal on both always 5) Fg is zero on both always What can you say about the force of gravity Fg acting on a stone and a feather? The force of gravity (weight) depends on the mass of the object!! The stone has more mass, therefore more weight.

  4. FN Fa Ffs Fg = mg Everyday Forces Force of Static Friction m

  5. FN Fa Ffk Fg = mg Everyday Forces Force of Kinetic Friction vi m

  6. Everyday Forces Coefficients of Friction μs μk Steel on steel 0.74 0.57 Aluminum on steel 0.61 0.47 Copper on steel 0.53 0.36 Rubber on concrete 1.0 0.8 Wood on wood 0.25-0.5 0.2 Glass on glass 0.94 0.4 Waxed wood on wet snow 0.14 0.1 Waxed wood on dry snow ------ 0.04 Metal on metal (lubricated) 0.15 0.06 Ice on ice 0.1 0.03 Teflon on Teflon 0.04 0.04

  7. y Everyday Forces Review of Similar Triangles x mg cos(q) mg mg sin(q)       

  8. FN a mg y Everyday Forces ΣFx = ma mgsin() = ma ΣFy = 0 q a = gsin() mg sin(q) mg sin(q) x FN = mg cos(θ) q Find the acceleration on a smooth incline (NO friction) mg cos(q)

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