Force Test

Question 1

4. An object in motion with no unbalanced forces acting on it will…

Answer 1

4. C (continue to move in its path at a constant speed)

U6/C3- pg. 20

Question 2

5. The upward force on an object falling through the air is…

Answer 2

5. A (air resistance)

U6/C3 - pg. 21

Question 3

6. The relationship amount mass, force, and acceleration is explained by…

Answer 3

6. C (Newton’s 2nd Law)

U6/C3 - pg. 22

Question 4

8. The size of the gravitational force between two objects depends on their…

Answer 4

8. Masses and distance between them

U6/C3 - pg. 22

Question 5

10. A baseball player swings his bat and misses the ball but hits a fly that was covering over home plate. The acceleration of the fly compared to what the acceleration of the ball would have been with the same force applied it would be…

Answer 5

10. B (larger)

U6/C2 - pg. 11

Question 6

12. Which statement below is false?

Answer 6

12. Weight is a constant no matter where you are located. (C)

U6/C3 - pg. 23

Question 7

13. When two forces on the same object are equal and opposite, these forces are called ______ forces.

Answer 7

13. Balanced Forces (B)

U6/C3 - pg. 20

Question 8

15. What is the weight of the box in the picture to the right?

Answer 8

15. 245 N (D)

U6/C3 - pg. 23

Question 9

17. Consider a watermelon that starts from rest and is dropped straight down from a tall building. Air resistance can be ignored. Which statement about the watermelon’s motion is false.

Answer 9

17. The watermelon falls with a constant velocity. (A)

U6/C3 - pg. 22

Question 10

18. A man weighing 800 N is standing on a chair. In order to support the man, what force is the chair exerting?

Answer 10

18. 800 N up (C)

U6/C3 - pg. 21.

Question 11

22. An object that is falling freely has a constant what?

Answer 11

22. Acceleration (C)

U6/C2 - pg. 11

Question 12

38b. What would be the speed of the falling sky diver eventually reach? What is the speed called?

Answer 12

38b. 55m/s - terminal velocity

U6/C3 - pg. 22

Question 13

38c. Why does this occur?

Answer 13

38c. Gravity plus air resistance become balance falling human falls at a constant velocity.

U6/C3 - pg. 22

Question 14

42. If a 53 kg Boulder falls off a cliff, what is the force with which it will hit the ground?

Answer 14

42. 519.4 N

U6/C3 - pg. 23

Question 15

43. A man and his bike or 95kg. His instantaneous speed at one point is 14m/s. The next time his speed is checked he is going 28m/s. If The second speed was taken seven seconds later, What force must the man have given his bike to change the speed? What was the bicyclist final momentum?

Answer 15

43. F= 190 N
    Pf= 2,660kg*m/s

U6/C3- pg. 23

Question 16

46. In a collision, a 25kg ball moving at

3m/s transfers all of its momentum to a 5 kg ball. What is the velocity of the 5 kilogram ball after the collision?

Answer 16

46. 15 m/s forwards

U6/C1 - pg. 4