Answers Are Shown in Red

Answers are shown in red

UNIT 4 QUIZ REVIEW - DUE MONDAY 12/20

Quiz is Wednesday, 12/22

Make sure to use all available resources in your Unit 4 Measuring Motion packet and and re-read/review Chapter 1 section 1. For the quiz you must demonstrate your ability to meet the following objectives:

1. Students will be able to describe the motion of an object by the position of the object in relation to a reference point.
2. Students will be able to identify the two factors that are needed in order to determine speed.
3. Students will be able to calculate speed.
4. Students will be able to construct and utilize a graph to measure and analyze changes in motion.
5. Students will be able to explain the difference between speed and velocity.
6. Students will be able to explain the relationship between velocity and acceleration.

1. The motion of an object can be studied by observing the changes in an object’s ______in relation to a reference point.

A. position.

B. size.

C. mass.

D. density.

2. The best way to measure the motion of a car on a highway is to compare the car's position with the position of

A. any other moving object.

B. a slower car.

C. a faster car.

D. a stationary object.

3. Suppose you can run 4 m/s. Four meters per second is your

A. position.

B. time.

C. speed.

D. distance.

4. Suppose you ride to school on a bus that makes several stops and takes one hour to go a distance of 30 km. The ______of the bus is 30 km/h.

A. total speed

B. average speed

C. average time

D. average distance

5. The average speed of a car that travels a distance of 240 km in three hours is

Average speed = total distance / total time

SHOW YOUR WORK! Average speed = 240km/3 hours

A. 720 km/h. = 80 km/hour

B. 120 km/h.

C. 80 km/h.

D. 40 km/h.

6. A commuter train rounds a curve at a constant speed of 37 km/h. The train’s velocity changes as the train travels around the curve because the train

A. slows down.

B. speeds up.

C. goes at a constant speed.

D. changes direction.

8. A car traveling at a velocity of 18 m/s north begins to accelerate. After 3 seconds, the car’s velocity is 27 m/s north. The car’s acceleration is

Acceleration = final speed – initial speed / time

SHOW YOUR WORK! Acceleration = 27m/sec-18m/sec

3 sec

A. 1 m/s/s north. = 3 m/sec/sec

B. 3 m/s/s north.

C. 6 m/s/s north.

D. 9 m/s/s north.

9. Explain what your answer to number 8 means. It means that for every second that passes, the speed is increasing by 3 m/sec

10. The ______of a communications satellite in orbit around Earth constantly changes because it changes direction.

A. distance

B. velocity

C. weight

D. speed

11. Describe the speed of object A as compared to object B based upon the information on the distance vs. time graph below Object A is traveling faster, steeper slope means that a greater distance is being traveled in a shorter amount of time

distance (m)

time (sec)

12. Describe the motion of the object between points A and B on the distance vs. time graph below.

distance (m)

stopped – there is no increase in distance

Time (sec)

13. What does the slope of a line on a distance vs. time graph tell you? The speed of the object

Acceleration Graph

Speed(m/sec)

Time (sec)

14. Use the acceleration graph above to describe the acceleration of the object between points A and B. ( INCREASE, DECREASE, OR REMAIN CONSTANT)

15. Use the acceleration graph above to describe the acceleration of the object between points B and C. ( INCREASE, DECREASE, OR REMAIN CONSTANT)

16. Use the acceleration graph above to describe the acceleration of the object between points C and D. ( INCREASE, DECREASE, OR REMAIN CONSTANT)