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2.3 010 projectile_motion
- 1. How does the horizontal and vertical motion differon the x- and y-planes?
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- 9. Projectile Motion For aprojectile: a) b) c) Describe the horizontal and vertical motion. Horizontal constant velocity Vertical accelerating Describe the horizontal and vertical Horizontal zero acceleration. Vertical 9.8 m/s2 What equations would you use to calculate horizontal and vertical motion. Horizontal v = d/t Vertical v = at and d = ½ at2
- 10. Horizontally… If you throwa projectile horizontally Describe the horizontal will it What is the horizontal at a speed of 25 m/s, how fast acceleration for projectile. 3 s? motion of a a projectile? be moving, horizontally, after A projectile moveswill still be Horizontally, it horizontally Horizontal acceleration is zero. with constant25 m/s. moving at velocity.
- 11. If a projectileis thrown What What a speed horizontally at happens, vertically, as a happens, vertically, as of 25 m/s, howvertical Describe the fast is aprojectile moves projectile moves the projectile moving motion of a projectile. upward? 3 downward? s? vertically after Vertically, a projectile slows Vertically, a projectile speeds Vertically, projectile will a way up. Vertically,on the projectile theway down. down the up on accelerates… be moving 29.4 m/s. …at a rate of 9.8 m/s2 Vertically…
- 12. Initially… 25 m/s 0 vertical velocity So,if you throw a projectile horizontally at a speed of After 3 s… 25 m/s 25 m/s, how fast is it moving after 3 seconds? actual 30 m/s Horizontally, it is moving at 25 39 m/s m/s, vertically it is moving 30 30 m/s m/s, so (by Pythagorean’s Theorem) the projectile is moving 25 m/s at 39 m/s. motion
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- 14. B4 stopped Projectile motionproblems… The key to solving problems involving projectile motion is… • understanding that x and y are independent. • identifying and separating x and y variables. • understanding that time is the same for both x and y. • Using appropriate equations for x and y.
- 15. Projectile motion problems… Usefultips… • Draw a picture. • Make a table with an x column and a y column to identify variables. • Immediately write down acceleration due to gravity (g) in the y column. • Time connects x and y.
- 16. Projectile motion problems… Equations… •Along the x-axis: – no acceleration; moves w/ constant velocity. – v = d/t • Along the y-axis: – Accelerates b/c of gravity; g = 9.8 m/s2. – v = at – d = ½at2
- 17. Lamp on atable… If I knock a lamp off an end-table with a horizontal velocity of 5 m/s and the table is 0.5 meters high, how far away does the lamp land? 1.6 meters in front of table.
- 18. B1 stopped Kickin’ rocks… Arock is kicked horizontally off a cliff and lands 125 meters in front of the cliff. If the cliff is 80 meters high, how fast is the rock initially kicked? 31.25 m/s horizontally.
- 19. A2 stopped Tossing pennies… Apenny is thrown horizontally of a building with a velocity of 10 m/s. If the penny lands 78 meters in front of the building, how tall is the building? It is 304.2 meters tall.
- 20. Stranded on amountain… An airplane traveling at 80 m/s at an elevation of 250 m, drops a box of supplies to skiers stranded in a snowstorm. At what horizontal distance from the skiers should the supplies be dropped? They need to be dropped 571.43 m before target (565.69 if using 10).
- 21. Stranded on amountain… (con’t) What is the speed of the box as it reaches the ground? It is going 106.3 m/s (106.8 m/s if using 10)
- 22. Stone throw… Paco, standingon a cliff, throws a stone with a horizontal velocity of 15.0 m/s and the stone hits the ground 47.0 m from the base of the cliff. How high is the cliff? The cliff is 48 m high.