What strategies do you use to solve word problems?

Question - Q Write what the problem wants you to solve for “What is the problem asking?”

Information - I Write the information that you have plus the units

Formula - F Determine the formula that you need by looking at the equation sheet and write it down

Rearrange - Ra Does the formula need to be rearranged? If yes, rewrite the formula to solve for the question (“unknown”)

Calculate - C Write the formula you will use Plug in the numbers with their units Calculate the problem in your calculator Write down the answer with units!

1. If you drive 100 km in 20 s, what is your average speed in km/s? Q Ra I C F

2. A rocket is launched 225 km in 25 s, what is the average speed of the rocket in km/s? Q Ra I C F

3. A person jogs 4. 0 km in 32 min, the 2 3. A person jogs 4.0 km in 32 min, the 2.0 km in 22 min, and finally 1.0 km in 16 min. What is the jogger’s average speed in km/min? Q Ra I C F

4. A plane’s average speed between two cities is 600 km/h 4. A plane’s average speed between two cities is 600 km/h. If the trip takes 2.5 hours, how far does the plane fly? Q Ra I C F

5. Two ants race across a table 50cm long 5. Two ants race across a table 50cm long. Ant one travels at 4cm/s and ant two travels at 2cm/s. How long does it take for each ant to race across the table? Which ant wins? Q Ra I C F

Activator If a greyhound can run up to 45mi/h. How long would it take a greyhound to run 10 mi? Q Ra I C F

Activator Write the question and fill in the F, Ra, and C: Q: d Ra: I: v = 10 m/s C: t = 4 s F:

Activator Write the question and fill in the F, Ra, and C: Q: t Ra: I: v = 10 m/s C: d = 50 m F:

What is the average speed of a cheetah that sprints 100 m in 4 s? Q Ra I C F

2. If a car moves with an average speed of 60 km/hr for an hour, it will travel a distance of 60 km. How far will it travel if it continues this average rate for 4 hrs? Q Ra I C F

3. A runner makes one lap around a 200 m track in a time of 25. 0 s 3. A runner makes one lap around a 200 m track in a time of 25.0 s. What was the runner's average speed? Q Ra I C F

4. A motorist travels 406 km during a 7. 0 hr period 4. A motorist travels 406 km during a 7.0 hr period. What was the average speed in km/hr? Q Ra I C F

5. A bullet is shot from a rifle with a speed of 720 m/s 5. A bullet is shot from a rifle with a speed of 720 m/s. What time is required for the bullet to strike a target 3240 m away? Q Ra I C F

6. The peregrine falcon is the world's fastest known bird and has been clocked diving downward toward its prey at constant vertical velocity of 97.2 m/s. If the falcon dives straight down from a height of 100 m, how much time does this give a rabbit below to consider his next move as the falcon begins his descent? Q Ra I C F

7. Hans stands at the rim of the Grand Canyon and yodels down to the bottom. He hears his yodel back from the canyon floor 5.20 s later. Assume that the speed of sound in air is 340.0 m/s. How deep is the canyon? Q Ra I C F

8. The horse racing record for a 1. 50 mi 8. The horse racing record for a 1.50 mi. track is shared by two horses: Fiddle Isle, who ran the race in 143 s on March 21, 1970, and John Henry, who ran the same distance in an equal time on March 16, 1980. What were the horses' average speeds in mi/s? Q Ra I C F

Activator Write your own word problem and solve the problem using QIFRaC. When you are done, get a whiteboard, marker and paper towel.

Problem 1 Gina travels 55 miles on her bicycle in 3 hours. What is Gina’s speed on mi/hr? Q Ra I C F

Problem 2 A rocket takes off with a velocity of 745 m/s. How high does the rocket go in 13 s? Q Ra I C F

Problem 3 A jet plane travels 132 m/s for 4 s. How far did the jet travel? Q Ra I C F

Problem 4 How long will your trip take if you travel 350 km at an average speed of 80 km/hr? Q Ra I C F

Problem 5 How far will you travel in 180 seconds running at a rate of 6 m/s? Q Ra I C F

Problem 6 A trip to Cape Canaveral, Florida takes 10 hours. The distance is 816 km. What is the average speed? Q Ra I C F

Problem 7 How long will it take a satellite to travel 450,000 m at a rate of 120 m/s? Q Ra I C F

Problem 8 What is the speed of a walking person if the person travels 1000 m in 20 min? Q Ra I C F

Problem 9 If a total distance of 750 m is covered in a time interval of 25 s, what is the average speed? Q Ra I C F

Problem 10 Jason travels 2m/s for 12 s. How far did he travel? Q Ra I C F

Rearrange the equation Q: d F: I: v Ra: t

Rearrange the equation Q: t F: I: v Ra: d

Rearrange the equation Q: v F: I: d Ra: t