Description of Motion - Scalar vs Vector Quantities

Practice Problems
Description of Motion - Scalar vs Vector Quantities

Directions: On this worksheet you will practice with the basic definitions of introductory motion.

omit

Question 1 A bike messenger traveled 4 blocks North, 4 blocks East, 7 blocks South, and finally 10 blocks West in order to deliver a package in the traffic, congested city. If his trip took 35 minutes, what was the magnitude of his average velocity in blocks/minute?

2.57 x 10^-11.92 x 10^-16.71 x 10⁰2.5 x 10¹7.14 x 10^-1

omit

Question 2 If the messenger in Question #1 could have traveled directly to his destination, what would have been the direction of his net displacement?

204.1 deg153.4 deg116.6 deg206.6 deg155.9 deg

omit

Question 3 The magnitude of an object's average velocity can ONLY equal the magnitude of its average speed when the object is

standing stilltraveling in successive
directions that change by 90ºtraveling in a circletraveling in a
straight line

omit

Question 4 A scalar is a quantity that can be completely described by stating its

sizesize and directiondirection

omit

Question 5 A family taking a vacation traveled 4 hours at 65 mph and then 4 hours at only 48 mph. What was their average speed during this trip?

56.5 mph56.5 mph50.9 mph56.5 mph

omit

Question 6 Which quantity is NOT a scalar?

distanceaccelerationtimemass

omit

Question 7 Which description of an object's motion is more specific: moving at a constant speed or moving at a constant velocity?

the two terms are completely equivalentconstant velocity since it demands that the object
not only move at a constant rate,
but also maintain a constant directionconstant speed since it demands that the object
has to maintain a constant rate
regardless of its direction of motion

omit

Question 8 A student warming up for practice travels one full circuit, 400 meters, around the track. Initially he jogs 70 meters at 1.5 m/sec, then runs 210 meters at 2.2 m/sec, and finally cools down by finishing the final 120 meters at 1.0 m/sec. What was his average speed?

2.35 m/sec1.57 m/sec1.53 m/sec1.72 m/sec

omit

Question 9 What was the student's average velocity in Question #8?

0 m/secthe same as his average speedcannot be determined

omit

Question 10 During a 30 minute period of time, one car moves at a constant velocity of 45 mph, N, while a second car moves at a constant velocity of 45 mph, W. During this time interval, the cars would have the same

A. instantaneous speed

B. instantaneous velocity

C. displacement

D. acceleration

A and CB and CA and DC and DB and D

omit

Question 11 A moving van completes its journey of 525 kilometers in 10 hours. Approximately how far should it have traveled 8 hours after beginning its trip?

336 km105 km66 km420 km