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ICP: Chapter 11
Practice Test Questions
| Question | Answer |
|---|---|
| Examine Figure 11-1. If you were standing under the tree, which object would appear to be moving? | the airplane |
| A passenger in the rear seat of a car moving at a steady speed is at rest relative to | the front seat of the car |
| Which distance can be most accurately measured with a ruler? | the width of a book |
| One kilometer equals 1000 meters. What does the prefix kilo- mean? | 1000 |
| A person walks 1 mile everyday for exercise, leaving her front porch at 9:00 A.M. What is the total displacement of her daily walk? | 0 |
| 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? | by driving east 3 blocks from the starting point |
| A ball is rolled uphill a distance of 3 meters before it slows, stops, and begins to roll back. The ball rolls downhill 6 meters before coming to rest against a tree. What is the magnitude of the ball's displacement? | 3 meters |
| Displacement vectors of 1 km south, 3 km north, 6 km south, and 2 km north combine to a total displacement of | 2 km |
| What is the most appropriate SI unit to express the speed of a cyclist in the last leg of a 10-km race? | km/h |
| Speed is the ratio of the distance an object moves to | the amount of time needed to travel the distance |
| Instantaneous speed is measured | at a particular instant |
| A car traveled 88 km in 1 hour, 90 km in the next 2 hours, and then 76 km in 1 hours before reaching its destination. What was the car's average speed? | 63.5 km/h |
| The slope of a line in a distance-time graph is | speed |
| A horizontal line on a distance-time graph means the object is | at rest |
| What is the speed of a bobsled whose distance-time graph indicates that it traveled 100m in 25s? | 4m/s |
| A distance-time graph indicates that an object moves 100m in 4s and then remains at rest for 1s. What is the average speed of the object? | 20m/s |
| A river current has a velocity of 5 km/h relative to the shore, and a boat moves in the same direction as the current at 5 km/h relative to the river. How can the velocity of the boat relative to the shore be calculated? | by adding the vectors |
| Vector addition is used when motion involves | more than one direction, more than one speed, more than one velocity |
| The rate at which velocity changes is called | acceleration |
| Which example identifies a change in motion that produces acceleration? | a ball moving at a constant speed around a circular track |
| Objects in free fall near the surface of the Earth experience | constant acceleration |
| Which example describes constant acceleration due to ONLY a change in direction? | traveling around a circular track |
| Suppose you increase your walking speed from 1 m/s to 3 m/s in a period of 2 s. What is your acceleration? | 1 m/sec^2 |
| An object moving at 30 m/s takes 5 s to come to a stop. What is the object's acceleration? | -6 m/s^2 |
| A speed-time graph shows that a car moves at 10 m/s for 10 s. The car's speed then steadily decrease until it comes to a stop at 30 s. Which of the following describes the slope of the speed-time graph from 10 s to 30 s? | linear, sloping downward |
| An object that is accelerating may be | slowing down, gaining, speed, changing direction |
| A train approaching a crossing changes speed from 25 m/s to 10 m/s in 240 s. How can the train's acceleration be described? | the train's acceleration is negative |
| What is instantaneous speed? | how fast a velocity changing at a specific instant |
| True or False: An object at rest has an instantaneous acceleration of zero? | true |
| The motion of an object looks different to observers in different ________________________. | frame of references |
| The SI unit for measuring _____________ is the meter. | distance (length) |
| The direction and length of a straight line form the starting point to the ending point of an object's motion is __________________. | displacement |
| Displacement and velocity are examples of _______________ because they have both magnitude and direction. | vectors |
| The sum of two or more vectors is called the ______________________. | resultant vector |
| Speed is measured in units of _________________. | meters/second |
| A car's speedometer measures ___________________________. | instantaneous speed |
| v= d/t is the equation that defines ________________________. | average speed |
| A constant slope on a distance-time graph indicates _______________ speed. | constant |
| The difference between speed and velocity is that velocity indicates the ________________ of motion and speed doesn't. | direction |
| A distance-time graph indicates an object moves 20 km in 2 h. The average speed of the object is ___________ km/h. | 10 |
| Because its _______________ is always changing, an object moving in a circular path experiences a constant change in velocity. | direction |
| Two or more velocities add by _____________________. | vector addition |
| A moving object does not ________________ if its velocity remains constant. | accerlerate |
| Freely falling objects accelerate at 9.8 m/s^2 because the force of _________________ acts on them. | gravity |
| The velocity of an object moving in a straight line changes at a constant rate when the object is experiencing constant ___________________. | acceleration |
| Accelerated motion is represented by a(an) _______________ line on a distance-time graph. | curved |
| A car that increases at a speed from 20 km/h to 100 km/h undergoes ________________ acceleration. | positive |
| ____________________________ is how fast a velocity is changing at a specific instant. | Instantaneous speed |
| From which frame of reference in Figure 11-1 does the tree appear to be in motion? | airplane |
| What is the SI unit best suited for measuring the height of a building? | meter |
| Distance is a measure of length. What information does displacement give in addition to distance? | direction |
| A child rolls a ball 4 m across the a room. The ball hits the wall and rolls halfway back toward the child. Using vector addition, calculate the ball's displacement. | 2 m |
| Which is the most suitable SI unit for expressing the speed of a race car? | km/h |
| What are the two types of speed that can be used to describe the motion of a car driving on the highway? | instantaneous speed & average speed |
| What is the significance of the slope in a distance-time graph? | shows speed |
| Vector addition allows you to add what two quantities for any number of vectors? | magnitude & direction |
| What types of changes in motion cause acceleration? | speed, direction, & both speed/direction |
| What information does the slope of a speed-time graph provide? | acceleration |
| During a race, a runner runs at a speed of 6 m/s. Four seconds later, she is running at a speed of 10 m/s. What is the runner's acceleration? | 1 m/sec^2 |
| 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? | 10 hours |
| How is velocity different form speed? | Velocity is how far and in what direction Speed is only how fast |
Created by:
dakota_thornell2