1. Motion

5. Suppose a graph of distance traveled by a body versus time is constructed. The slope of the graph at any point may be identified with A. instantaneous acceleration. B. instantaneous velocity. C. average acceleration. D. average speed.

B. instantaneous velocity.

A car's motion is described by a distance versus time graph. In which portion of the graph the car has the maximum speed? A)From A to B B)From B to C C)From C to D

C)From C to D

20. For the first hour a car is driven at a constant speed of 90 km/hr. The motor begins to vibrate and the driver reduces the speed to 45 km/hr for another 2 hours. The average speed for the entire trip is A. 90.0 km/hr. B. 25.5 km/hr. C. 60.0 km/hr. D. 67.5 km/hr. E. 45.0 km/hr.

C. 60.0 km/hr.

19. A ball is thrown straight up. It reaches its highest point and then falls back. Which of the following is the correct statement? A. Throughout its motion, the ball's velocity is zero. B. At the highest point in its motion, the ball's acceleration is zero. C. At the highest point in its motion, the ball's velocity is zero. D. Throughout its motion, the ball's acceleration is zero. E. At the highest point in its motion, the ball's velocity and acceleration are zero.

C. At the highest point in its motion, the ball's velocity is zero.

28. A rifle bullet is fired horizontally at the same instant another bullet is allowed to drop from rest at the same height. Which bullet strikes the earth first? A. The bullet from the rifle B. The bullet allowed to drop C. Both strike at the same instant.

C. Both strike at the same instant.

2. A quantity that is a measure of how the velocity of a body changes with time is A. distance. B. speed. C. acceleration. D. time

C. acceleration.

If a bird feather and a bowling ball are dropped from a certain height at the same time, which of the following is true: 1) The feather will have bigger acceleration. 2) The bowling ball will have bigger acceleration. 3) Both will have the same acceleration

3) Both will have the same acceleration

Which of the following statement is correct as the ball moves upward? acceleration remains constant. 1) It's acceleration is decreasing. 2) Both, it's speed and acceleration are decreasing. 3) Its speed is decreasing, but its acceleration remains constant.

3) Its speed is decreasing, but its acceleration remains constant.

Which of the following statement is correct as the object falls towards the ground? 1) It's acceleration is increasing. 2) Both, it's speed and acceleration are increasing. 3) Its speed is increasing, but its acceleration remains constant.

3) Its speed is increasing, but its acceleration remains constant.

The two balls start at the same height as shown. One is dropped from rest while a second is fired horizontally with a speed v. Which one hits the ground first? 1. Red Ball 2. Yellow Ball 3. Both hit at the same time 4. Depends on the mass of the ball

3. Both hit at the same time

A ball is tossed up in the air, it reaches the maximum height and starts falling downward. At the maximum height the ball is momentarily at rest. The acceleration of the ball at that height is: 1. 0 m/s2 2. Greater than 9.8 m/s2 3. Exactly 9.8 m/s2 4. Less than 9.8 m/s2

3. Exactly 9.8 m/s2

A ball is dropped with a speed of 14 m/s from a building 12 m high. What is the acceleration of the ball when it is 6 m from the ground? 1. Greater than 9.81 m/s2 2. Less than 9.81 m/s2 3. Exactly 9.81 m/s2

3. Exactly 9.81 m/s2

In which of the following cases the car is not accelerating? A) The car travels at a constant speed on a straight road B) The car slows down to a stop C) The car speeds up from rest D) The car slows down while going around a turn

A) The car travels at a constant speed on a straight road

14. A car moving initially at 30 m/s comes gradually to a stop in 900 m. What was the acceleration of the car? A. -0.5 m/s2 . B. -5 m/s2 . C. -10 m/s2 . D. -20 m/s2 .

A. -0.5 m/s2

12. Your car can accelerate at 8.0 m/s2 , and there are 1609 m in one mile. So you can go from zero to 60 mi/hr in about A. 3.35 s. B. 2.74 s. C. 1.34 s. D. 0.37 s.

A. 3.35 s.

1. In a speedometer test zone on a highway, you drive 4 miles in 5 minutes. During the test, your speedometer reading is 45 mi/hr. Your speedometer reading is A. lower than your actual speed. B. equal to your actual speed. C. higher than your actual speed.

A. lower than your actual speed.

7. A quantity that is a measure of how the distance traveled changes with time is A. speed. B. force. C. acceleration. D. momentum. E. velocity

A. speed.

4. A student releases a ball from rest on an inclined plane and measures that it travels a distance of 0.5 m in a time of 2.0 s. The acceleration of the ball is A. 0.125 m/s2 B. 0.25 m/s2 C. 0.5 m/s2 D. 1.0 m/s2

B. 0.25 m/s2

22. A sprinter moving at 10 m/s slows down at a rate of 1.4 m/s2 . How fast is the runner moving after 4 seconds? A. 0 m/s. B. 4.4 m/s. C. 5.8 m/s. D. 15.6 m/s.

B. 4.4 m/s.

27. For identical cannons and identical projectiles and identical initial speeds, but different pointing angles, the maximum distance for its projectile is attained for the cannon which launches at A. 32 above horizontal. B. 45 above horizontal. C. either 32 or 58 above horizontal. D. zero degrees—a flat trajectory.

B. 45 above horizontal.

3. In order to go from rest to 50 m/s in 10 s, a jet must be able to accelerate at A. 2 m/s2 B. 5 m/s2 C. 20 m/s2 D. 50 m/s2

B. 5 m/s2

15. Neglecting friction, if a Cadillac and Volkswagen start rolling down a hill together, the heavier Cadillac will get to the bottom A. before the Volkswagen. B. after the Volkswagen. C. at the same time as the Volkswagen.

C. at the same time as the Volkswagen.

11. A policeman walks on his beat back and forth. His average speed is determined from A. his velocity divided by the time. B. time divided by how far he ends up from the starting point. C. his total distance covered divided by the time. D. time divided by his total distance covered.

C. his total distance covered divided by the time.

9. You travel 2640 feet in thirty seconds while in a 65 mi/hr zone. (There are 5280 ft in one mi.) Your average speed is A. larger than the speed limit. B. exactly the speed limit. C. less than the speed limit

C. less than the speed limit.

13. Which of the following is not an appropriate unit for measuring acceleration? A. miles/hr/s B. ft/s2 C. m/s D. km/min/s E. m/min2

C. m/s

24. You toss a ball straight up in the air. At the highest point, the ball's A. velocity and acceleration are zero. B. acceleration is zero but not its velocity. C. velocity is zero and the acceleration is downward. D. velocity is zero and the acceleration is upward.

C. velocity is zero and the acceleration is downward.

During a softball game, a player running from second base to third base reaches a speed of 4.5 m/s before she starts to slide into third base. When she reaches third base 1.3 s after beginning her slide, her speed is reduced to 0.6 m/s. The players acceleration during the slide is: A) 4 m/s. B)-2 m/s2 C) 3 m/s D) -3 m/s2

D) -3 m/s2

18. A car is traveling at the velocity of 20 m/s on a flat road when it reaches the bottom of a hill. It coasts up the hill, coming to rest in 8 seconds. The average acceleration of the car while on the hill is A. 10 m/s2 . B. 2.5 m/s2 . C. 0 m/s2 . D. -2.5 m/s2 . E. -10 m/s2 .

D. -2.5 m/s2

25. An iron robot falls from rest at a great height. Neglecting air resistance, what is its speed after it has fallen for 3.5 seconds? A. 9.8 m/s B. 9.8 m/s2 C. 13.3 m/s D. 34.3 m/s

D. 34.3 m/s

6. If your average speed for a 6 hr trip is 60 mi/hr, the distance traveled is A. 10 mi. B. 60 mi. C. 120 mi. D. 360 mi.

D. 360 mi.

8. A car starts from rest and reaches 20 m/s in 5 seconds. The average acceleration of the car is A. zero m/s2 B. 1.0 m/s2 C. 2.0 m/s2 D. 4.0 m/s2 E. 10.0 m/s2

D. 4.0 m/s2

26. In a laboratory on Earth, all the air is pumped from a large tube. A feather and a steel ball are simultaneously released from rest inside the tube. What happens next? A. Both objects float weightless inside the tube. B. The steel ball falls and hits the bottom before the feather. C. The feather falls and hits the bottom before the steel ball. D. Both objects fall and hit the bottom at the same time.

D. Both objects fall and hit the bottom at the same time.

10. An object's distance traveled as a function of time is shown in the graph above. The graph shows A. an object experiencing an acceleration. B. an object with increasing speed. C. an object turning in a circle. D. an object moving forward

D. an object moving forward

23. Refer to the graph below. The speed of the object is largest A. in region A. B. in region B. C. in region C. D. in region D. E. in region E.

D. in region D.

21. A ball thrown upward reaches its maximum height and then falls back. If air resistance is negligible, its acceleration is A. less on the way up than on the way down. B. less on the way down than on the way up. C. the same up and down but zero at the top. D. the same at all points in the motion.

D. the same at all points in the motion.

16. A car is driven between two nearby towns at an average speed of 50 miles/hour. The average velocity of the car A. will always be the same as the average speed. B. will always be less than the average speed. C. will be the same as or greater than the average speed. D. will be the same as or less than the average speed. E. will always be greater than the average speed.

D. will be the same as or less than the average speed.

17. A body travels at an initial speed of 2.5 m/s. Given a constant acceleration of 0.2 m/s2 , what is the speed of the body at time 25 seconds later? A. 3.4 m/s. B. 3.6 m/s. C. 5.5 m/s. D. 6.0 m/s. E. 7.5 m/s.

E. 7.5 m/s.