Question

write the letters of the correct answers on the lines at left.
______ 1. daylons family just bought a new puppy, and daylon decided to take him for a walk. he put the puppy in a wagon and pulled the wagon along the sidewalk. from which of these reference points does the puppy appear to be moving?
a. daylon
b. the wagon
c. the sidewalk
d. the puppys collar
______ 2. two school classes are playing tug - of - war with a rope. one class pulls on the rope with a 75 n force to the left, while the other pulls with a 40 n force to the right. which two statements describe this situation?
a. the forces are balanced, and the rope does not move.
b. the forces are unbalanced, and the rope will move to the left.
c. the net force on the rope is 115 n to the right.
d. the net force on the rope is 35 n to the left.
______ 3. you might have noticed that a feather falls slowly toward the ground, while a ball falls rapidly. which statement correctly explains the motion of these objects?
a. the ball does not experience fluid friction as it falls.
b. gravity is the only force acting on the feather and the ball.
c. the acceleration of the ball and feather are the same.
d. the feather experiences more fluid friction than the ball.
______ 4. nicki rides her bike at a constant speed for 6 km. that part of her ride takes her 1 hour. she then rides her bike at a constant speed for another 9 km. that part of her trip takes her 2 hours. what is her average speed?
a. 3.00 km/h
b. 5.00 km/h
c. 5.25 km/h
d. 7.50 km/h
circle the words that correctly complete the paragraph.

1. susan ran a 400 - m sprint at a track meet, and her final time was 65 s. she reported that her velocity in the race was 6.15 m/s. susans statement was inaccurate because she mentioned only (direction / acceleration / slope / speed). she did not include (acceleration / speed / direction / slope), which is also a part of velocity.

Explanation:

Step1: Analyze question 1

The puppy is in the wagon. Relative to the wagon and its own collar, it doesn't move. Relative to Daylon who is pulling the wagon at the same speed as the wagon - puppy system, it doesn't move. But relative to the sidewalk, it is moving.

Step2: Analyze question 2

The force to the left is 75 N and to the right is 40 N. The net force $F_{net}=75 - 40=35$ N to the left. Since the net - force is non - zero, the forces are unbalanced and the rope will move to the left.

Step3: Analyze question 3

Both the feather and the ball experience gravity. But the feather has a larger surface area and lower mass, so it experiences more fluid friction (air resistance) than the ball, which is why it falls more slowly.

Step4: Analyze question 4

The total distance $d = 6+9=15$ km and the total time $t=1 + 2=3$ hours. The average speed $v=\frac{d}{t}=\frac{15}{3}=5$ km/h.

Step5: Analyze question 5

Velocity is a vector quantity that requires both speed and direction. Susan only mentioned the magnitude (speed) and not the direction.

Answer:

1. C
2. B, D
3. D
4. B
5. speed; direction