| A | B |
|---|
| When an object’s distance from another object is changing, | it is in motion. |
| As Earth orbits the sun, it is moving about | 30 kilometers per second. |
| A place or object used for comparison to determine if something is in motion is called | a reference point. |
| Speed equals distance divided by | time. |
| When you know both the speed and direction of an object’s motion, you know the | velocity of the object. |
| Average speed is | the total distance traveled divided by the total time. |
| If you know the distance an object has traveled in a certain amount of time, you can determine | the speed of the object. |
| If the speed of an object does NOT change, the object is traveling at a | constant speed. |
| If a bicyclist travels 30 kilometers in two hours, her average speed is | 15 km/h. |
| If an object moves in the same direction and at a constant speed for 4 hours, which of the following is true? | The object’s velocity did not change. |
| If you know a car traveled 300 kilometers in 3 hours, you can find its | average speed. |
| A car travels 85 km in the first hour of a trip. The car continues to travel for 2 more hours and travels 200 km. What was the average speed of the car for the trip? | 95 km/h |
| The rate at which velocity changes is called | acceleration. |
| Which of these is an example of deceleration? | a car approaching a red light |
| It is rare for any motion to | stay the same for very long. |
| Changing direction is an example of a kind of | acceleration. |
| The moon accelerates because it is | continuously changing direction. |
| A runner rounding a curve on a track at a constant speed is an example of what type of acceleration? | changing direction |
| To determine the acceleration rate of an object, you must calculate the change in speed during each unit of | time. |
| If speed is measured in kilometers per hour and time is measured in hours, the unit of acceleration is | kilometers per hour per hour. |
