Lecture 4a - Texas Tech University

Lecture 4a - Texas Tech University

Projectile Motion Examples Example 4.3: The Long Jump Problem: A long-jumper (Fig. 4.12) leaves the ground at an angle i = 20 above the horizontal at a speed of vi = 8.0 m/s. a) How far does he jump in the horizontal direction? (Assume his motion is equivalent to that of a particle.) b) What is the maximum height reached? Example: Driving off a cliff!!

y is positive upward, yi = 0 at top. Also vyi = 0 vx = vxi = ? vy = -gt x = vxit, y = - ()gt2 Time to Bottom: t = 2yf/(-g) = 3.19 s vxi = (xf/t) = 28.2 m/s How fast must the motorcycle leave the cliff to land at xf = 90 m, yf = -50 m? vxi = ?

Kicked football vyi vf i = 37,vvxii = 20 m/s vxi = vicos(i) = 16 m/s, vyi= visin(i) = 12 m/s a. Max height? b. Time when hits ground? c. Total distance traveled in the x direction?

d. Velocity at top? e. Acceleration at top? Conceptual Example vyi vxi vyi vi

vxi Demonstration!! Conceptual Example: Wrong Strategy vi Shooting the Monkey!! Demonstration!! Example

xi = 0 yi = 0 i i i2 i1 i1

Range (R) of projectile Maximum horizontal distance before returning to ground. Derive a formula for R. Range R the x where y = 0! Use vxf = vxi , xf = vxi t , vyf = vyi - gt yf = vyi t ()g t2, (vyf) 2 = (vyi)2 - 2gyf First, find the time t when y = 0 0 = vyi t - ()g t2 t = 0 (of course!) and t = (2vyi)/g

Put this t in the x formula: xf = vxi (2vyi)/g R R = 2(vxivyi)/g, vxi= vicos(i), vyi= visin(i) R = (vi)2 [2 sin(i)cos(i)]/g R = (vi)2 sin(2i)/g (by a trig identity) Example 4.5: Thats Quite an Arm! Problem: A stone is thrown

from the top of a building at an angle i = 26 to the horizontal and with an initial speed vi = 17.9 m/s, as in Fig. 4.14. The height of the building is 45.0 m. a) How long is the stone "in flight"? b) What is the speed of the stone just before it strikes the ground?

Example: A punt! vi = 20 m/s, i = 37 vxi = vicos(i) = 16 m/s, vyi= visin(i) = 12 m/s Proof that projectile path is a parabola xf = vxi t , yf = vyi t ()g t2 Note: The same time t enters both equations! Eliminate t to get y as a function of x. Solve x equation for t: t = xf/vxi

Get: yf = vyi (xf/vxi) ()g (xf/vxi)2 Or: yf = (vyi /vxi)xf - [()g/(vxi)2](xf)2 Of the form yf = Axf B(xf)2 A parabola in the x-y plane!! Problem vi = 65 m/s 65

Example 4.6: The Stranded Explorers Problem: An Alaskan rescue plane drops a package of emergency rations to a stranded party of explorers, as shown in the picture. If the plane is traveling horizontally at vi = 42.0 m/s at a height h = 106 m above the ground, where does the package strike the ground relative to the point at which it is released? vi = 65 m/s h

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