1. Which of the following correctly lists friction types (excluding fluid friction) from strongest to weakest? (2 points) *

Question

a. static, sliding, rolling
b. sliding, static, magnetic
c. weak, strong, nuclear
d. rolling, sliding, static***
2. Two or more velocities add by ________. (2 point) *
a. Vector addition*****
b. Scalar addition
c. Vector multiplication
d. Scalar multiplication
3. A marathon runner sets out on a run. She runs 3 km east, 1 km north, then 3 km west, and lastly 1 km south. Which of the following statements is FALSE? (2 points) *
a. The displacement of the round trip is zero.****
b. The distance of the round trip is 8 km.
c. After driving 3 km east, the magnitude of the distance and displacement are the same.
d. After driving 3 km east and 1 km north, the magnitude of the distance and displacement are the same.
4. All of the following are measurements for speed, EXCEPT: (2 point) *
a. miles/hour
b. seconds/hour***
c. meters/hour
d. inches/hour
5. When the forces on an object are balanced, the object does not move. (2 point) *
TRUE
FALSE****
6. A NASCAR driver is driving around a race track at a constant speed. He is accelerating. (2 point) *
TRUE
FALSE***
7. Two forces present in projectile motion are: (2 points) *
a. Gravity and acceleration****
b. Gravity and initial forward velocity
c. Gravity and air resistance
d. Gravity and weak nuclear force

Answer 1

1. incorrect (review friction concepts)
2. correct
3. incorrect. (review concept of displacement)
4. correct.
5. incorrect. (Please explain justification of your choice)
6. incorrect. (review circular motion)
7. incorrect. (acceleration is not a force. review definition of a force and topic projectiles).

Anon, I think you have a lot of catching up to do. I suggest you review relevant topics and give another attempt. Alternatively, please explain the reasoning behind your choice of answers, and we'll take it from there.