Calculating Speed

Calculating Speed

Multiple Select

So which of these represents the speed of an object?

• A snail covers an inch every hour

• The car drove north at 60 mph

• The cyclist turned the sharp curve without loosing speed

• It takes Mrs. Eddy 30 minutes to walk 3 miles

Speed is a ratio comparing distance traveled with the time it takes to go that distance.

S = Distance/ Time

D = speed x time

T= distance/speed

Multiple Select

Which of these would be units for speed?

• kilometers

• mph

• kilometers per hour

• meters per second

Multiple Choice

If a car travels 400m in 20 seconds how fast is it going?

• 400 m/s

• 40 m/s

• 20 m/s

• 20 km/s

Multiple Choice

In a competition, an athlete threw a flying disk 139 meters through the air. While in flight, the disk traveled at an average speed of 13.0 m/s. How long did the disk remain in the air?

Which formula do you need to use to solve this problem?

• S= D/T

• D= SXT

• T=D/S

Multiple Choice

A plane travels 395,000 meters in 9000 seconds. What was its speed?

• 43.9 meters per second

• 43.9 miles per hour

• .02 meters per second

• .02 meters per hour

Multiple Choice

How far can your little brother get if he can travel at 2.5 m/s and in 5 seconds you will discover that his squirt gun has run out of paint?

Which formula would you use to solve this problem?

• S=D/T

• T=D/S

• D=SXT

Averge Speed can also be calculated from graphed data.

Multiple Choice

What is the average speed of the object graphed here? Take TOTAL distance and TOTAL time from graph and solve.

• 80 meters per minute

• 40 meters per minute

• 20 meters per minute

We can also find the average speed for a SECTION of the graphed motion.

Multiple Choice

What was the average speed of the object shown here between 0 and 10 seconds?

• 10 m/s

• 100 m/s

• 1 m/s