Average speed.pptx
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This document discusses average speed, which is the total distance traveled divided by the total travel time. It provides examples of calculating average speed using the formula. It also discusses units and converting between units like meters and kilometers. Finally, it introduces the concepts of velocity, distance, and displacement, explaining that velocity is a vector quantity that includes both magnitude and direction of motion.
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Average speed.pptx
- 1. Average Speed Average speed indicates the average rate of movement during the entire time of the travel (t) throughout the entire distance traveled (d). It uses the formula: average speed = 𝐭𝐨𝐭𝐚𝐥 𝐝𝐢𝐬𝐭𝐚𝐧𝐜𝐞 𝐭𝐫𝐚𝐯𝐞𝐥𝐞𝐝 𝐭𝐨𝐭𝐚𝐥 𝐭𝐫𝐚𝐯𝐞𝐥 𝐭𝐢𝐦𝐞
- 2. Sample Problem 1.) The cheetah, considered the fastest land animal, can travel 625 m in 25.0 s. what is its average speed? Given: d = 625 m t = 25 s Required: average speed Solution: average speed = 𝐭𝐨𝐭𝐚𝐥 𝐝𝐢𝐬𝐭𝐚𝐧𝐜𝐞 𝐭𝐫𝐚𝐯𝐞𝐥𝐞𝐝 𝐭𝐨𝐭𝐚𝐥 𝐭𝐫𝐚𝐯𝐞𝐥 𝐭𝐢𝐦𝐞 = 𝒅 𝒕 = 𝟔𝟐𝟓 𝒎 𝟐𝟓.𝟎 𝒔 = 25.0 m/s
- 3. 2.) How far can the cheetah in the previous problem go in one minute? Given: v = 25 m/s t = 1.00 min = 60.0 s Required: d Solution: Note that the problem gives the time in minutes, but the speed obtained from the first problem is given in meter per second. It is important that your units agree with each other. Since 60 seconds is equal to 1 minute, distance = speed x time d = vt
- 4. distance = speed x time d = vt = 25.o 𝑚 𝑠 x 60.0 s = 1 500 m If the cheetah runs at 25.0 m/s, it can cover a distance 0f a 1 500 m in one minute.
- 5. 3.)How long will it take the cheetah to run a distance of 5.0 km if it runs at an average speed of 25 m/s? Given: v = 25 m/s d = 5.0 km Required: t Solution: Note that the problem gives the distance in kilometers but the speed is in meters per second. Again, make sure that your units agree with each other. Converting distance into meters. 5.0 km 1 000m 1km = 5 000 m
- 6. time = 𝐝𝐢𝐬𝐭𝐚𝐧𝐜𝐞 𝐭𝐫𝐚𝐯𝐞𝐥𝐞𝐝 𝐬𝐩𝐞𝐞𝐝 t = 𝒅 𝒗 t = 𝟓 𝟎𝟎𝟎𝒎 𝟐𝟓𝒎/𝒔 t = 𝟐𝟎𝟎 𝒔 If the cheetah runs at 25 m/s. it will take the cheetah 200 s to cover 5 km.
- 7. Solve the following: 1. Usain Bolt, a Jamaican sprinter, holds the Olympic and world records for the 100-m dash, which he achieved during the 2008 Summer Olympics in Beijing, China. He finished the 200-m dash in 19.30 seconds. What was his speed? 2. If a driver takes 30 min to get to the town market, which is 1.5 km away from your house, what is his average speed? 3. If a bus travelling at 69 km/h will cover a distance 0f 600 km, how many hours will it take to reach its destination?
- 8. Velocity - it is similar to speed except that it not only tells how fast or how slow a motion is; it also indicates the direction. Velocity is a vector quantity. Vector quantity describe both magnitude and direction. Distance - is simply the length between two points. Displacement - is another vector quantity that indicates both the distance and the direction of motion. - It tells how far and where you are from the starting point.
- 9. Direction: Identify the following quantities if it is a vector or a scalar quantity. 1.) 200 kg of meta 6.) 10 km to the north 2.) 200 N of falling bag 7.) a boy pushes a chair 3.) 9.8 m/s2 due to gravity 8.) 70 km/hr 45ᴑ 4.) A girl is walking at 9.) 100 m 200 m/s 5.) a dog running 28 km/hr 10.) Sandi traveled 200 km in two hours going to school
- 10. Practice Exercise: Solve for the missing variable. v (m/s) t (s) d (m) 40.0 40.0 1600 2.8 50.0 140 23.6 830