Speed

Speed

Unit 5

Speed

• Speed is equal to Distance over Time

• Speed = Distance/Time

• Units for Speed

Units for Speed

• meters per second (m/s)

• kilometers per hour (km/hr)

• miles per hour (mi/hr)

Example 1

John is running a distance of 50 meters and he does this in 25 seconds. What is his speed?

Answer Example 1

•   $50\ m\ \div25\ s$  
  

• 2 m/s

Multiple Choice

Adam is driving his car for a distance of 500 km in 3 hr. What is his speed?

• 1500 km/hr

• 166.7 km/hr

• 500 km/hr

• 100 km/hr

Multiple Choice

Kendra is walking home and her house is 200 m away. It takes her 20 seconds to get home. What was her speed?

• 400 m/s

• 200 m/s

• 25 m/s

• 10 m/s

Speed Triangle

We used this with density but now we can use this trick with speed. Speed is Distance over time so distance is on top of the triangle.

Solving for Time

• Cover the T with your hand on the Triangle

• What do you see?

•  $Dis\tan ce\ \div Speed$  

Multiple Choice

Abby is driving at a speed of 30 km/hr over a distance of 600 km. How long will it take her to go 600 km?

• 300 hr

• 20 hr

• 15 hr

• 90 hr

Multiple Choice

Mr. Mellon is walking to school at a pace of 5m/s and the school is 500 s away. How long will it take him to get to school?

• 100 s

• 2500 s

• 10 s

• 150 s

Solving for Distance

• Place your hand over the D in the Triangle

• What do you see?

• Speed x Time

Multiple Choice

Aaron is driving 70 km/hr for 3 hours. What distance did he cover?

• 25 km

• 210 km

• 70 km

• 1.5 km

Multiple Choice

Mike is running at a pace of 8 m/s for 8 seconds. What distance did he cover in 8 seconds?

• 64 m

• 1 m

• 8 m

• 24 m