SlideServe
Télécharger Obtenir Pro
Menu
Accueil Pro
Préférences
ApparenceLight Aide et commentaires
© SlideServe · v2026

Chapter 6 Projectile Motion

kyrene avatar
kyrene
27 diapositives · 728 Views · Oct 10, 2014

Chapter 6 Projectile Motion. Projectiles. A projectile is any object that moves through space where the only force acting on the object is gravity. The path that a projectile follows is called a trajectory. Projectile Motion. A ball thrown across the room follows an arced trajectory.

Chapter 6 Projectile Motion - slide 1
01 / 27Chapter 6 Projectile Motion
1 / 17

Télécharger la présentation

Chapter 6 Projectile Motion
Une image / un lien ci-dessous est fourni (tel quel) pour télécharger la présentation

Politique de téléchargement : le contenu du site vous est fourni TEL QUEL pour votre information et votre usage personnel ; il ne peut être vendu, concédé sous licence ni partagé sur d’autres sites sans l’accord de son auteur.Le contenu vous est fourni TEL QUEL, pour votre information et votre usage personnel uniquement. Téléchargez la présentation en cliquant sur ce lien. Lors du téléchargement, si vous ne parvenez pas à télécharger une présentation, l’éditeur a peut-être supprimé le fichier de son serveur.Pendant le téléchargement, si vous ne parvenez pas à obtenir une présentation, le fichier a peut-être été supprimé par l’éditeur.

F I N

Plus de contenu associé

Transcription de la présentation

  1. Chapter 6Projectile Motion Physics 1 (Garcia) SJSU

  2. Projectiles • A projectile is any object that moves through space where the only force acting on the object is gravity. • The path that a projectile follows is called a trajectory. Physics 1 (Garcia) SJSU

  3. Projectile Motion A ball thrown across the room follows an arced trajectory. Example of projectile motion, which combines horizontal and vertical motion. Physics 1 (Garcia) SJSU

  4. Projectile Motion Projectile motion combines uniform horizontal motion (constant speed)with freefall vertical motion (constant acceleration. Physics 1 (Garcia) SJSU

  5. Uniform Horizontal Motion 1 2 3 4 5 Equal Distances Arbitrary Rolling ball (with no friction) is an example of uniform motion. Velocity of the ball is constant so distance between “frames” (equal time between frames) is constant. Physics 1 (Garcia) SJSU

  6. Accelerating Vertical Falling 1 (Release) 1 1 Falling is an example of accelerating motion. 2 4 3 Total distance from point of release increases in the ratios 1:4:9:16:25:… or 12:22:32:42:52… 3 9 Distance between frames increases as 1:3:5:7:9…. 5 16 4 7 Physics 1 (Garcia) SJSU

  7. Projectile Motion 2 1 4 3 1 5 Arbitrary 3 Ball rolling off of a table combines horizontal and vertical motion. Falling starts with frame #4, vertical distances increasing as 1:3:5:7:… Horizontal distances equally spaced as with uniform motion. Frames #4 to #7 are projectile motion. 6 5 7 7 Physics 1 (Garcia) SJSU

  8. Check Yourself At the instant a cannon fires a cannonball horizontally over a level range, another cannonball held at the side of the cannon is released and drops to the ground. Which strikes the ground first? Physics 1 (Garcia) SJSU

  9. Demo: Fall and Fire FALL 1 FIRE 1 1 One ball is released and falls straight down. Other ball is fired horizontally. At all times the balls are at the same height. Hit the ground at the same time. 2 2 3 3 3 5 4 4 Physics 1 (Garcia) SJSU

  10. Movie: Shoot the Monkey http://www.youtube.com/watch?v=cxvsHNRXLjw

  11. Distance Fallen From Table 3.3 (page 47) we know that distance fallen in one second is 5 meters. This distance fallen is the same whether falling straight down or in projectile motion. 0.5 s 5 meters 1.0 s 1.5 s Physics 1 (Garcia) SJSU

  12. Projectile Motion & Curvature For initial speeds that are faster and faster, the range of the projectile is farther and farther. For very large speeds, the curvature of Earth starts to be noticeable. Physics 1 (Garcia) SJSU

  13. Projectiles Launched at an Angle With no gravity, projectile would follow a straight line. Due to gravity, projectile falls beneath this line, just as if released from rest. No Gravity With Gravity Physics 1 (Garcia) SJSU

  14. Parabolic Arc 4 1 3 5 Arbitrary Arbitrary 3 2 6 Up and down motion is symmetric, as shown. Frame #4 is highest point of the parabolic arc of projectile motion. 5 7 1 7 Physics 1 (Garcia) SJSU

  15. Maximum Range Maximum range is at 45 degrees (when air resistance is negligible). Physics 1 (Garcia) SJSU

  16. 45 degrees Demo: Trebuchet Trebuchet is a type of catapult popular in the 13th century. Warwolf Release Physics 1 (Garcia) SJSU

  17. Movie: Trebuchet Contestant in annual pumpkin throwing contest, Punkin Chukin Physics 1 (Garcia) SJSU

  18. Shape of the arc is changed. Object lands at steeper angle. Projectile Motion with Drag Range reduced by air resistance. Physics 1 (Garcia) SJSU

  19. Earth’s Curvature Curvature of the Earth is about 5 meters over a distance of 8000 meters (which is about 5 yards over 5 miles). Physics 1 (Garcia) SJSU

  20. Missing the Ground Suppose you throw a ball at a speed of 8000 m/s (about 18,000 mph). After one second, ball travels 8000 meters and falls 5 meters. In that distance, Earth curves by same amount (5 meters). If nothing stops the ball, what happens? 8000 m 5 m Curvature NOT to Scale Physics 1 (Garcia) SJSU

  21. Newton’s Mountain Newton drew a similar illustration, picturing cannons firing from a tall mountain. If a cannon was powerful enough, the cannonball would orbit Earth. Physics 1 (Garcia) SJSU

  22. Orbits and Centripetal Force Gravity provides the centripetal force required for a satellite to move in a circle. Physics 1 (Garcia) SJSU

  23. Check Yourself Satellites orbit at least 150 km (about 100 miles) above the surface of Earth because: There is almost no gravity at that altitude? There is almost no air resistance? Physics 1 (Garcia) SJSU

  24. Getting into Orbit Rocket needs to lift above the atmosphere and then fire thrusters to acquire the required orbital speed of about 8 kilometers per second. Returning to Earth, air resistance slows the spacecraft during reentry. Physics 1 (Garcia) SJSU

  25. Elliptical Orbits For speeds higher than 8 km/s, the orbit is elliptical instead of circular. Physics 1 (Garcia) SJSU

  26. Escape Speed If speed exceeds 11.2 km/s then object escapes Earth because gravity weakens (as object gets further away) and never slows the object enough to return it back towards Earth. Hyperbolic Circular Elliptical Physics 1 (Garcia) SJSU

  27. End of Part I:Mechanics Physics 1 (Garcia) SJSU