PES 111 General Physics I
Practice Exam 1
Definitions
1. (3 pts) Acceleration is a change in:
A. Speed
B. Position
C. Direction
D. All of the above
E. Only A and C
F. Only B and C
2. (3 pts) Which SI unit measures weight?
A. The kilogram
B. The pound
C. The newton
D. The erg
Concepts
3. (3 pts) A block rests on an inclined plane. Which of the free-body diagrams below
represents this block?
B.
Weight
Weight
Normal Force
A.
C.
Normal Force
Friction
Normal Force
D.
Weight
Friction
Normal Force
Friction
Weight
Friction
Applications
4. (5 pts) How fast is an object accelerating in SI units if it is accelerating 40 millimeters per
microsecond per microsecond? (nano=10-9, micro=10-6, milli=10-3)?
5.
R. Gist
(5 pts) An elevator initially traveling downward at 10 m/s begins to decelerate at a constant
rate of 1 m/s2. How long does it take the elevator to stop?
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PES 111 General Physics I
Practice Exam 1
6. (5 pts) You throw a ball upward against a brick wall with a speed of 20 m/s at an initial angle
of 60o above horizontal. You are standing 4 meters from the base of the wall. How high above
the point you release the ball does the ball hit the wall?
How long was the ball in the air before it hit the wall?
7. (5 pts) A girl swims 2 m/s in still water. She wishes to cross a river of width 100 m flowing
downstream at 1 m/s. She aims at a point 30o upstream and begins to swim. How long does it
take her to swim across?
8. (5 pts) What is the horizontal range of a cannon whose muzzle velocity is 340 m/s and is fired
at a 35o angle above horizontal? (ignore air resistance)
9.
r
(4 pts) What magnitude of acceleration will a force of F = (10iˆ − 24 ˆj ) N give to man sitting
in a rolling chair? The combined mass of man and chair is 78 kg. (Ignore any friction)
10. (4 pts) A 60 kg woman stands on a metric scale in an elevator. As the elevator begins to
descend, she notes that the scale reads 400 N. How quickly is the elevator decelerating?
11. (5 pts) Find the size of the displacement between the following Cartesian vectors:
Position 1 (given by the Cartesian vector <12, -5, 0> m)
Position 2 (given by the Cartesian vector <2, 2, 1> m).
12. (6 pts) Three ropes are attached to a tree and are pulled in different directions. The first force
is of magnitude 1000 N in the direction -3/5 iˆ + 4/5 ĵ . The second force is given by (320 iˆ +
1240 ĵ ) N. The third force has magnitude of 600 N, is in the x-y plane and directed 30
degrees below the positive x-axis. What is the resulting force vector on the tree?
R. Gist
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