Physics

27. A ball is thrown upward from the ground with a speed of 30 m/s. What will be its speed when it reaches its highest point?

a. 0 m/s

12. An object is moving east with a constant speed of 25 m/s for 5 seconds. What is the object's acceleration?

a. 0 m/s/s

29. A ball that is thrown upwards from the ground will eventually reach its highest point and fall back to the ground. Which of the following quantities will be constant over the course of this up and down motion?

c. The ball's acceleration.

13. Which one of the following statements is true of an object that has an acceleration of 6 m/s/s?

c. The object changes its velocity by 6 m/s each second.

5. Which statement is always true of an object that has gravitational potential energy?

c. The object is above the ground.

56. Newton's first law of motion applies to _____.

c. both objects that are at rest and those that move at constant velocity

77. Which one of the following is a unit of momentum?

c. kg • m/s

71. The amount of matter or "stuff" in an object is referred to as the _____ of the object.

c. mass

74. An object that has momentum MUST be _____.

c. moving

9. An object is moving rightward and speeding up. Its velocity is directed ______ and its acceleration is directed _____.

c. rightward, rightward

73. Momentum is _____.

c. the product of the mass and velocity of an object

72. The force of gravity that acts upon an object is referred to as the _____ of the object.

e. weight

For which one of the following motions is the object's displacement different than the distance traveled?

After a home run, a baseball player runs all the way around the bases

Newton's Third Law

For every action there is an equal and opposite reaction

Newton's Second Law

Force equals mass times acceleration

18. Which statement best describes a free-falling object?

a. It is an object that is under the sole influence of gravity.

2. Which is the best definition of the term kinetic energy?

a. Kinetic energy is the energy due to motion.

6. What factors must be considered in determining the direction of an object's velocity?

a. The direction that the object is moving.

78. Momentum is a vector quantity. What does the direction of the momentum vector depend upon?

a. The direction the object is moving.

58. An object that is experiencing two vertical forces - an upward and a downward force - is moving downward with a constant speed. What can be concluded about the strength of these two forces?

a. The two forces have the same strength.

41. The vector sum of two or more vectors is known as the ____.

a. resultant

63. An object is moving along a level surface with a constant velocity. The net force acting upon the object is _____.

a. zero

25. A ball is thrown upward from the ground with a speed of 20 m/s. Approximately how much time does it take for the ball to reach its highest point?

b. 2 seconds

2. Which of the following objects has an average velocity of 0 m/s?

b. A runner makes one complete lap around the track at a constant speed.

4. Which one of the following trucks has a northward displacement?

b. A truck travels south for 8 miles, turns around and travels north for 18 miles.

30. A ball that is thrown upwards from the ground will eventually reach its highest point and fall back to the ground. In which direction is the acceleration vector directed as the ball is rising towards its peak?

b. In the downward direction.

28. A ball that is thrown upwards from the ground will eventually reach its highest point and fall back to the ground. How does its initial speed (when launched from the ground) compare to its final speed (when it lands on the ground)? Assume a free fall motion.

b. Its initial speed is equal to its final speed.

51. Which one of the following quantities describes an object's tendency to resist a change in its state of motion?

b. Mass of the object.

79. An object is moving to the right at a constant speed. What is the direction of the momentum vector?

b. The momentum vector is directed rightward.

10. An object is moving leftward and slowing down. Its velocity is directed ______ and its acceleration is directed _____.

b. leftward, rightward

26. A ball is thrown upward from the ground with a speed of 20 m/s. Approximately how much time will the ball be in the air before it finally lands back on the ground?

c. 4 seconds

50. What property of an object describes its natural tendency to resist an acceleration?

c. Inertia

11. An object has an acceleration that is directed opposite of its motion. What is true of the object?

c. It is slowing down.

24. A ball is thrown upward with a speed of approximately 30 m/s. Which of the following sets of numbers are good estimates of the ball's velocity 1 second, 2 seconds and 3 seconds later?

d. 20 m/s, 10 m/s, 0 m/s

5. Which one of the following objects has a average speed of 40 mi/hour?

d. A car moves a distance of 80 miles and is 40 miles from the starting point after 2 hours.

8. Which one of the following characteristics is true of all accelerating objects?

d. Accelerating objects are changing their velocity.

3. Which one of the following statements describes a fast-moving object?

d. An object move relatively far in a short amount of time

15. What does the slope of the line on a position-time plot describe about an object's motion?

d. It describes how fast and in what direction the object is moving.

69. Which of the following statements describe the essential difference between the mass and the weight of an object?

d. Mass refers to the amount of stuff an object possesses and weight is the force of gravity.

42. A 5-ton airplane normally flies at 200 km/hr. If it experiences a 50 km/hr tailwind (i.e., a wind from behind), then its resultant velocity will be ___ km/hr.

d. d. 250

1. If an object has energy, then one can be certain that it ____.

d. has the ability to do work on another object

76. An object that is speeding up would have _____.

e. an increasing momentum