P4_ Fma - PHY 101 Free Fall, Force, Mass & Newtons laws...

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PHY 101 Free Fall, Newton’s laws of motion
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Free Fall Δx = area Δv = g t = ½ g t 2
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Free Fall All objects, under the influence of only gravity fall. (We are neglecting air resistance) They all fall with a constant acceleration (down) of g = 9.8 m/s 2 (on earth) The mass of the object doesn’t matter! Heavy and light objects all fall with the same g It doesn’t matter in which direction it is moving it has an acceleration of g
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Tennis balls are tested by measuring their bounce when dropped from a height of approximately 2.5 m. What is the final speed of a ball dropped from this height? Example Problem v i =0 v = aΔt Δx= ½ a (Δt) 2 v 2 = 2 a Δx A. v = 1 m/sec B. v = 3 m/sec C. v = 7 m/sec D. v = 14 m/sec
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Throwing stones (up) What happens if you toss a stone straight up? v(3) v(1) v(0) . v(4) =0. It reaches its highest point when it stops going up, i.e. when v = 0 a is always downward it is g
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Throwing stones (up) What happens when it starts coming down again? v(3)
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P4_ Fma - PHY 101 Free Fall, Force, Mass & Newtons laws...

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