Tag Archives: What is the magnitude of the average net force acting on the car?

Newton’s First & Second Laws

1. With one exception, each of the following units can be used to express mass. What is the exception?
2. A) newton
3. B) slug
4. C) gram
5. D) N•s²/m
6. E) kilogram

 

1. Complete the following statement: The term net force most accurately describes
2. A) the mass of an object
3. B) the inertia of an object.
4. C) the quantity that causes a displacement.
5. D) the quantity that keeps an object moving.
6. E) the quantity that changes the velocity of an object.

Newton’s First & Second Laws

3. Which one of the following terms is used to indicate the natural tendency of an object to remain at rest or in motion at a constant speed along a straight line?
4. A) velocity
5. B) inertia
6. C) acceleration
7. D) equilibrium
8. E) force
9. A net force is required to give an object with mass m an acceleration a.  If a net force 6 is applied to an object with mass 2m, what is the acceleration on this object?
10. A)
11. B) 2
12. C) 3
13. D) 4
14. E) 6

 

5. When the net force that acts on an object is 96 N, the object accelerates at a rate of 48 m/s². Determine the mass of the object.
6. A) 25 kg
7. B) 0 kg
8. C) 0 kg
9. D) 5 kg
10. E) 0 kg

Newton’s First & Second Laws

6. A net force of 25 N is applied for 5.7 s to a 12-kg box initially at rest. What is the speed of the box at the end of the 5.7-s interval?
7. A) 8 m/s
8. B) 12 m/s
9. C) 0 m/s
10. D) 5 m/s
11. E) 30 m/s

 

7. A 975-kg car accelerates from rest to 26.7 m/s in a distance of 120 m. What is the magnitude of the average net force acting on the car?
8. A) 740 N
9. B) 2900 N
10. C) 91 N
11. D) 1300 N
12. E) 7900 N

 

8. A 2150-kg truck is traveling along a straight, level road at a constant speed of 55.0 km/h when the driver removes his foot from the accelerator. After 21.0 s, the truck’s speed is 33.0 km/h.  What is the magnitude of the average net force acting on the truck during the 21.0 s interval?
9. A) 2250 N
10. B) 626 N
11. C) 1890 N
12. D) 972 N
13. E) 229 N

Newton’s First & Second Laws

9  Two forces act on a 16-kg object.  The first force has a magnitude of 68 N and is directed 24° north of east.  The second force is 32 N, 48° north of west.  What is the acceleration of the object resulting from the application of these two forces to the object?

1. A) 6 m/s², 5.5° north of east
2. B) 9 m/s², 18° north of west
3. C) 4 m/s², 34° north of east
4. D) 6 m/s², 5.5° north of west
5. E) 1 m/s², 52° north of east

 

10. An apple crate with a weight of 175 N accelerates along a frictionless surface as the crate is pulled with a force of 14.5 N as shown in the drawing.

What is the horizontal acceleration of the crate?

 

1. A) 40 m/s²
2. B) 768 m/s²
3. C) 29 m/s²
4. D) 597 m/s²
5. E) 644 m/s²

Newton’s First & Second Laws

11. Two forces act on a 6.7-kg block resting on a frictionless surface as shown. What is the magnitude of the horizontal acceleration of the block?

 

1. A) 8 m/s²
2. B) 2 m/s²
3. C) 82 m/s²
4. D) 2 m/s²
5. E) 9 m/s²

 

1. E) The magnitude of the acceleration will be the same in all four cases shown above.

 

Newton’s Third Law

 

A horse pulls a cart along a flat road.  Consider the following four forces that arise in this situation.

(1) the force of the horse pulling on the cart (3) the force of the horse pushing on the road

(2) the force of the cart pulling on the horse (4) the force of the road pushing on the horse

 

13. Which two forces form an “action-reaction” pair that obeys Newton’s third law?
14. A) 1 and 4
15. B) 1 and 3
16. C) 2 and 4
17. D) 3 and 4
18. E) 2 and 3

Newton’s First & Second Laws

14. Suppose that the horse and cart have started from rest; and as time goes on, their speed increases in the same direction. Which one of the following conclusions is correct concerning the magnitudes of the forces mentioned above?
15. A) Force 1 exceeds force
16. B) Force 2 is less than force
17. C) Force 2 exceeds force
18. D) Force 3 exceeds force
19. E) Forces 1 and 2 cannot have equal magnitudes.

 

A book is resting on the surface of a table.  Consider the following four forces that arise in this situation:

(1) the force of the earth pulling on the book (3) the force of the book pushing on the table

(2) the force of the table pushing on the book (4) the force of the book pulling on the earth

Newton’s First & Second Laws

15. Which two forces form an “action-reaction” pair that obeys Newton’s third law?
16. A) 1 and 2
17. B) 1 and 3
18. C) 1 and 4
19. D) 2 and 4
20. E) 3 and 4

 

15. Determine the magnitude of the acceleration of the spacecraft.
16. A) 6 m/s²
17. B) 36 m/s²
18. C) 5 × 10^–3 m/s²
19. D) 0 × 10^–3 m/s²
20. E) 06 × 10^–3 m/s²

^APA.