Test - Forces

Question 1

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

Answer 1

Acceleration NB 20-24

Question 2

14. Consider a watermelon that starts from rest and is dropped straight down from a tall building. Air resistance can be ignored. What statements about the watermelon’s motion would be true?

Answer 2

After 2 s, it’s velocity is 19.6 m/s, the watermelon has a positive acceleration, and the watermelon’s acceleration due to gravity is 9.8 m/s2 NB 20-24

Question 3

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

Answer 3

800 N and NB 20-24

Question 4

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

Answer 4

Larger NB 20-24

Question 5

22. In a picture of a cup with a piece of paper on the top and a coin on top of the paper, if the card were quickly pulled off the cup, what property would explain why the coin falls into the cup rather than moving with the card?

Answer 5

Inertia NB 20-24

Question 6

33 c. Why does terminal velocity happen?

Answer 6

Gravity and air resistance become balanced when gravity pushes down and air resistance pushes up NB 20-24