Speed.

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Presentation transcript:

Speed

Let’s hope this isn’t you! http://www.youtube.com/watch?v=Qhm7-LEBznk

Distance (d) The measurement from one point to another How far something has traveled Possible units for distance: Miles (mi) Kilometers (km) Feet (ft) Centimeters (cm)

Displacement How far you are from the start

Time (t) How long it takes for something to happen Possible units for time: Minutes (min) Seconds (s) Hours (hr)

Speed (s or v) How quickly an object gets from place to place How fast or slow Speed = distance / time

Units for Speed Units for speed is a derived unit This means it comes from 2 other units (distance and time) Examples: Miles per hour (mph) Meters/second (m/s) Kilometers/hour (km/hr)

Cover up what you are solving for! Speed Cover up what you are solving for! d s t s = d/t

d s t d = s x t What is the formula to solve for distance? Cover up what you are solving for! d = s x t

d s t t = d/s What is the formula to solve for time? Cover up what you are solving for! t = d/s

Speed is distance over time! http://www.youtube.com/watch?v=4CWlNoNpXCc

5-Step Problem Solving What you know What you are solving for Formula Fill-in Final Answer with Units

5-Step Problem Solving What you know What you are solving for Formula Fill-in Final Answer with Units A car takes four hours to reach its destination. The distance was 340 miles. What was the speed of the car?

5-Step Problem Solving What you know What you are solving for Formula Fill-in Final Answer with Units A boat was traveling at a speed of 36 km/hr. It has to travel a distance of 210 km. How long will it take?

5-Step Problem Solving What you know What you are solving for Formula Fill-in Final Answer with Units The speed of a cruise ship is 50 km/hr. How far will it travel in 14 hours?

5-Step Problem Solving What you know What you are solving for Formula Fill-in Final Answer with Units A hydroplane made speed records by traveling 239 miles in 45 minutes. What is its record-breaking speed in mph?

5-Step Problem Solving What you know What you are solving for Formula Fill-in Final Answer with Units A football field is about 100 m long. If it takes a person 20 seconds to run its length, how fast (what speed) were they running?

5-Step Problem Solving What you know What you are solving for Formula Fill-in Final Answer with Units A bullet travels at 850 m/s. How long will it take a bullet to go 1 km?