Unit 4 Review

The Johnson family traveled from Ohio to Rhode Island.

They left at 12:00 p.m., traveled 42 miles, and stopped to eat at McDonalds.

They continued driving another 65 miles and arrived in Rhode Island at 5:00 p.m.

What was the family’s average speed? 

• 25.6 miles per hour

• 15.3 miles per hour

• 21.4 miles per hour
• 30 miles per hour

Answer explanation

Speed = Distance/Time

42 + 65 miles / 5 hours

107 miles / 5 hours

21.4 miles per hour

2. Mary is going on vacation.

3. Her car is unreliable so it takes her 14 hours to travel a distance of 450 miles.

4. What is her average speed?

5. Round to the nearest whole number. 

• 40
• 50
• 25
• 32

Answer explanation

Speed = Distance / Time

What is the difference between speed and velocity?

• Velocity measures distance only, not direction.
• Speed can be negative while velocity cannot.
• Velocity includes direction and Speed does not.

Joe rolled down a hill 6.1 meters long. He made it to the bottom in 371 seconds.

Allysa rolled down a hill 3.5 meters. She made it to the bottom in 475 seconds.

Who was the slowest roller? What was his/her speed?

• Allysa was the slowest roller at 0.007368 m/s.
• Allysa was the fastest roller at 0.007368 m/s.
• Joe was the slowest roller at 0.0164 m/s.
• Joe was the slowest roller at 0.0163 m/s.

How do you calculate Speed?

• Speed = Distance / Time
• Speed = Distance - Time
• Speed = Distance + Time
• Speed = Time / Distance

Tags

NGSS.MS-PS3-1

Because Velocity is calculated using displacement, if the displacement is 0, the velocity is...

• Undefined
• -1
• 1
• 0

True or False-

Velocity and Displacement are always the same.

• True
• False

39 miles per hour East is an example of

• Velocity

• Speed

• Distance

• None of the Above

A train travels west for 3 hours and has a displacement of 135 miles. A second train travels west for 5 hours and has a displacement of 135 miles. Which of the following correctly identifies the similarities between the motion of the two trains?

• They have the same Speed and Direction

• They have the same direction and went the same distance

• They have the same velocity and time.

• They have the same Time and the same direction.

If you move 80 miles in .58 hours, your speed is..

• 120 miles per hour
• 137.93 miles per hour
• 100 miles per hour
• 150 miles per hour