Test - Unit 6 Force

Question 1

2. A firefighter feels the hose pushing backwards onto him as he uses it to put out a fire. What is most likely the part of this?

Answer 1

The exerting water exerts an equal and opposite force on the hose

U6 C3 notes p. 23

Question 2

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

Answer 2

Newton’s second law

U6 C3 notes p.22

Question 3

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

Answer 3

Larger

U6 C3 notes p.20

Question 4

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

Answer 4

The watermelon falls with a constant velocity

U6 C3 notes p.21

Question 5

19. What is the net force on the block.

3N ——> [ ]

Answer 5

2 N left

U6 C3 notes p. 20

Question 6

20. If the block in the picture has an acceleration of 1m/s squared what would the blocks mass be.

3N ——> [ ]

Answer 6

2kg

U6 C3 notes p.1

Question 7

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

Answer 7

Acceleration

U6 C2 notes p.11

Question 8

24. In the picture, if the card were quickly pulled off the cup lick the arrow suggests, what property would explain why the coin falls into the cup rather than moving with the card

Answer 8

Inertia

U6 C3 notes p.20

Question 9

32. Related to the amount of force needed to change an object

Answer 9

Momentum

U6 C3 notes p.23

Question 10

33. Why dose someone not wearing a seatbelt in a car fly forward when the car stops suddenly? Make sure to include which law explains this

Answer 10

Newton’s first law, because objects in motion will resist a change in motion, due to inertia

U6 C1 notes p.20

Question 11

34. Why dose it take more effort to make a bowling ball accelerate 25m/s squared than to make a tennis ball accelerate 25m/s squared? Make sure to include which law explains this.

Answer 11

Newton’s 2nd law, because the bowling ball has more mass thus needs a greater force to acceleration it

U6 C1 notes p.22

Question 12

38. b. What speed will the skydiver eventually reach? What is the speed called?

Answer 12

55 m/s
Terminal velocity

U6 C3 notes p.22

Question 13

38. c. Why does terminal velocity occur?

Answer 13

Gravity and air resistance

U6 C3 notes p.22

Question 14

46. What dose the answer to a velocity problem have to have?

Answer 14

M/s direction

U6 C1 notes p.3