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MEASURING MOTIONBY: TOYA LEFTWICHThis tutorial will teach students how to measure motion in terms of speed, time, and distance.

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Home Navigation Overview Constant Speed Average Speed Calculating Speed Guided Practice (S) Guided Practice (T) Guided Practice (D) Assessment Resources

Overview

How do you describe motion that’s taking place?

To describe motion, you must discuss speed.

Speed is the distance an object travels per unit of time.

To calculate speed to divide the distance it travels by the time it travels.

Speed equals distance per time distance (d)

time (t)

Speed is expressed in:kilometers (km)

hour (hr)

meters (m)

second (s)

kilometers (km)

hour (hr)


Constant Speed

An object that does not change it’s speed is traveling at a constant speed.

At any given interval, the object has a speed of 10 meters/second.


Average Speed

Average speed is equal to the total distance divided by the total time.

The average speed displayed on the graph is 42 kilometers per hour.


Calculating Speed

Speed = distance time

Time = distance speed

Distance = speed x time

Hint: Cover the one that you are trying to solve.

D

S T


Guided Practice (S)

Solve for speed:


Ex. A car race is 500 km long. It takes the winner 2.5 hours to complete it. How fast was he going?

Speed = distance = 500 km = 200 km/hr time 2.5 hrs

Ex. If a car travels 9 m in 3 s, what is the speed of the car? ___________


Click

Speed = distance = 9 m = 3 m/s time 3 s

Guided Practice (T)

Solve for time:

Time= distance speed

Ex. It is 320 km to Las Vegas. If you average 80km/hr, how long will it take for you to get there?

Time= distance = 320 km = 4 hrs speed 80km/hr

Ex. The boy jogged 60 km in at a speed of 60 km/hr. How long did it take? ____________


Click

Time= distance = 60 km= 1 hr speed 60 km/hr

Guided Practice (D)

Solve for distance:


Ex. You are going on a trip. You average 80km/hr for 6hrs. How far did you go?

Distance = speed x time = 80km/hr x 6hrs = 400 km

Ex. The girl averaged 5 miles/hr for 2 hrs. How far did she run? ____________


Click

Distance = speed x time = 5mi/hr x 2hrs = 10 miles

Assessment




Using the given equations, solve the problems.

1. A football field is about 100 m long. If it takes a person 20 seconds to run its length, how fast (what speed) was he/she running?

a. 80 m/s

b. 120 m/s

c. 5 m/s

2. Every summer I drive to Michigan. It is 3900 km to get there. If I average 100km/hr, how much time will I spend driving?

a. 4000 hrs

b. 39 hrs

c. 10 hrs

3. If you drive at 100 km/hr for 6 hours, far will you go?

a. 600 km

b 106 km

c. 6000 km

4. If you run at 12 m/s for 15 s, how far will you go?

a. 180 m

b. 0.8 m

c. 3 m


Resources

-Holt, Rinehart and Winston (2001). Holt Science Spectrum: A Physical Approach. Texas

-Tennessee End-of-Course Physical Science Coach. (2005). Publisher’s Partnership: Writer


YIPPEE!

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Education

speed speed

average speed average

assessment speed

distance speed distance

hrs speed

terms of speed

speed equals distance

speed x time hint