Test Physic 1401

Topics: Force, Classical mechanics, Friction Pages: 4 (1086 words) Published: October 29, 2012
PHYS 1401 College Physics I Test 2 Page 1 of 6
Houston Community College System
PHYS 1401
Test # 2 PHYS 1401 College Physics I Test 2 Page 2 of 6
Name ______________________________________________________ Date ____________ PHYSICS 1401. Test 1
Chapters 3, 4 and 5
_____________________________________________________________________________ INSTRUCTIONS:
Answer all questions from Section I (2 points per question). And
Solve at least four problems from Section II (20 points per problem). More than four problems from Section II can be attempted. However, points will be awarded for only the best four answers. NOTE: Credit will only be given for answers accompanied by work carried out. Therefore, make sure all calculations are attached to the test. _____________________________________________________________________________ Section I

1. A student adds two vectors with magnitudes of 200 and 40. Which one of the following is the only possible choice for the magnitude of the resultant? a. 100
b. 200
c. 260
d. 40
2. A car is initially moving at 20 m/s east and a little while later it is moving at 10 m/s north. Which of the following best describes the orientation of the average acceleration during this time interval? a. northeast

b. northwest
c. west
d. north of west
3. A baseball is thrown by the center fielder (from shoulder level) to home plate where it is caught (on the fly at shoulder level) by the catcher. At what point is the magnitude of the acceleration at a minimum? (air resistance is negligible) a. just after leaving the center fielder’s hand

b. just before arriving at the catcher’s mitt
c. at the top of the trajectory
d. acceleration is constant during entire trajectory PHYS 1401 College Physics I Test 2 Page 3 of 6 4. If we know an object is moving at constant velocity, we may assume: a. the net force acting on the object is zero.

b. there are no forces acting on the object.
c. the object is...
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