What is instantaneous speed is measured ...?

Answer 1

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Correct Partial Credit Incorrect

Multiple Choice

Identify the letter of the choice that best completes the statement or answers the question.

1.

Which distance can be most accurately measured with a ruler?(1 point)

• (0 pts) the length of a river
• (1 pt) the width of a book
• (0 pts) the distance between two cities
• (0 pts) the size of an object under a microscope

1 /1 point

2.

A person drives north 3 blocks, then turns east and drives 3 blocks. The driver then turns south and drives 3 blocks. How could the driver have made the distance shorter while maintaining the same displacement?(1 point)

• (1 pt) by driving east 3 blocks from the starting point.
• (0 pts) by driving north 1 block and east 4 blocks.
• (0 pts) by driving west 3 blocks from the starting point.
• (0 pts) by driving back to the starting point by the same route.

1 /1 point

3.

Displacement vectors of 1 km south, 3 km north, 6 km south, and 2 km north combine to a total displacement of(1 point)

• (0 pts) 12 km
• (0 pts) 6 km
• (0 pts) 4 km
• (1 pt) 2 km

1 /1 point

4.

Instantaneous speed is measured(1 point)

• (0 pts) at the starting point.
• (0 pts) when the object reaches its destination.
• (1 pt) at a particular instant.
• (0 pts) over the duration of the trip.

0 /1 point

5.

A car traveled 88 km in 1 hour, 90 km in the next 2 hours, and then 76 km in 1 hour before reaching its destination. What was the car's average speed?(1 point)

• (0 pts) 254 km/h
• (1 pt) 63.5 km/h
• (0 pts) 209 km/h
• (0 pts) 74.5 km/h

1 /1 point

6.

A horizontal line on a distance-time graph means the object is(1 point)

• (0 pts) moving at a constant speed.
• (0 pts) moving faster.
• (0 pts) slowing down.
• (1 pt) at rest.

1 /1 point

7.

A distance-time graph indicates that an object moves 100 m in 4 s and then remains at rest for 1 s. What is the average speed of the object?(1 point)

• (0 pts) 50 m/s
• (0 pts) 25 m/s
• (1 pt) 20 m/s
• (0 pts) 100 m/s

1 /1 point

8.

What example identifies a change in motion that produces acceleration?(1 point)

• (0 pts) a speed skater moving at a constant speed on a straight track
• (1 pt) a ball moving at a constant speed around a circular track
• (0 pts) a particle moving in a vacuum at constant velocity
• (0 pts) a vehicle moving down the street at a steady speed

1 /1 point

9.

Objects in free fall near the surface of the Earth experience(1 point)

• (0 pts) constant speed.
• (0 pts) constant velocity.
• (1 pt) constant acceleration.
• (0 pts) constant distance.

1 /1 point

10.

The slope of a speed-time graph indicates(1 point)

• (0 pts) direction.
• (1 pt) acceleration.
• (0 pts) velocity.
• (0 pts) speed.

1 /1 point

Completion

Complete each sentence or statement.

11.

The motion of an object looks different to observers in different _____________.(1 point)(1 pt) frames of reference

(1 pt) perspectives

(1 pt) speed

(1 pt) frames of references

(1 pt) frame of references

(1 pt) frame

(0 pts) perspective

0 /1 point

12.

The direction and length of a straight line from the starting point to the ending point of an object's motion is _____________.(1 point)(1 pt) displacement

1 /1 point

13.

The difference between speed and velocity is that velocity indicates the _____________ of motion and speed does not.(1 point)(1 pt) direction

1 /1 point

Short Answer

14.

Bus A travels 300 m in 12 s. Bus B travels 200 m in 12 s. Both vehicles travel at constant speed. How do the distance-time graphs for these two speeds differ?(3 points)Essay:

bus A was going 25m/s bus B was going 16m/s1 /3 points

15.

What is the significance of the slope in a distance-time graph? (3 points)Essay:

to show acceleration3 /3 points

16.

What types of changes in motion cause acceleration?(3 points)Essay:

change in position3 /3 points

Problem

17.

If you ride your bike at an average speed of 2 km/h and need to travel a total distance of 20 km, how long will it take you to reach your destination? Show your work.(3 points)Essay:

20 / 2 = 10h3 /3 points

Essay

18.

Picture a ball traveling at a constant speed around the inside of a circular structure. Is the ball accelerating? Explain your answer.(5 points)Essay:

no because its going a constant speed5 /5 points

Other

19.

Calculating Using vector addition, calculate the distance traveled by the object and the displacement of the object represented by the figure.

(5 points)Essay:

a displacment is 11 meters, B displacement is 5 meters distance traveled is the same5 /5 points

The final score is 31/35 (88.6%).