Download Unit 1 Practice Test

Physical Science Unit 1 Test
Multiple Choice
Identify the choice that best completes the statement or answers the question.
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1. Which distance can be most accurately measured with a ruler?
a. the length of a river
c. the distance between two cities
b. the width of a book
d. the size of an object under a microscope
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2. A person walks 1 mile every day for exercise, leaving her front porch at 9:00 A.M. and returning to her front
porch at 9:25 A.M. What is the total displacement of her daily walk?
a. 1 mile
c. 25 minutes
b. 0
d. none of the above
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3. A ball is rolled uphill a distance of 3 meters before it slows, stops, and begins to roll back. The ball rolls
downhill 6 meters before coming to rest against a tree. What is the magnitude of the ball’s displacement?
a. 3 meters
c. 9 meters
b. 6 meters
d. 18 meters
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4. Displacement vectors of 1 km south, 3 km north, 6 km south, and 2 km north combine to a total displacement
of
a. 12 km.
c. 4 km.
b. 6 km.
d. 2 km.
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5. Speed is the ratio of the distance an object moves to
a. the amount of time needed to travel the distance.
b. the direction the object moves.
c. the displacement of the object.
d. the motion of the object.
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6. A car traveled 88 km in 1 hour, 90 km in the next 2 hours, and then 76 km in 1 hour before reaching its
destination. What was the car’s average speed?
a. 254 km/h
c. 209 km/h
b. 63.5 km/h
d. 74.5 km/h
____
7. A horizontal line on a distance-time graph means the object is
a. moving at a constant speed.
c. slowing down.
b. moving faster.
d. at rest.
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8. What is the speed of a bobsled whose distance-time graph indicates that it traveled 100 m in 25 s?
a. 4 m/s
c. 0.25 mph
b. 250 m/s
d. 100 m/s
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9. A distance-time graph indicates that an object moves 100 m in 4 s and then remains at rest for 1 s. What is the
average speed of the object?
a. 50 m/s
c. 20 m/s
b. 25 m/s
d. 100 m/s
____ 10. The rate at which velocity changes is called
a. speed.
b. vectors.
c. acceleration.
d. motion.
____ 11. Suppose you increase your walking speed from 1 m/s to 3 m/s in a period of 2 s. What is your acceleration?
a. 1 m/s2
b. 2 m/s2
____ 12. The slope of a speed-time graph indicates
a. direction.
b. acceleration.
c. 4 m/s2
d. 6 m/s2
c. velocity.
d. speed.
____ 13. A speed-time graph shows that a car moves at 10 m/s for 10 s. The car’s speed then steadily decreases until it
comes to a stop at 30 s. Which of the following describes the slope of the speed-time graph from 10 s to 30 s?
a. linear, horizontal
c. linear, sloping downward
b. curved, upward
d. linear, sloping upward
____ 14. The SI unit of force is the
a. joule.
b. kilogram.
c. meter.
d. newton.
____ 15. When an unbalanced force acts on an object,
a. the object’s motion does not change.
b. the object accelerates.
c. the weight of the object decreases.
d. the inertia of the object increases.
____ 16. When a pair of balanced forces acts on an object, the net force that results is
a. greater in size than both forces combined. c. equal in size to one of the forces.
b. greater in size than one of the forces.
d. equal to zero.
____ 17. What kind of friction occurs as a fish swims through water?
a. fluid
c. sliding
b. rolling
d. static
Figure 12-1
____ 18. Figure 12-1 shows the motion of three balls. The curved paths followed by balls B and C are examples of
a. centripetal motion.
c. linear motion.
b. constant motion.
d. projectile motion.
____ 19. Projectile motion is caused by
a. the downward force of gravity.
b. an initial forward velocity.
c. a final vertical velocity.
d. the downward force of gravity and an initial forward velocity.
____ 20. The property of matter that resists changes in motion is called
a. friction.
c. inertia.
b. gravity.
d. weight.
____ 21. An orange might roll off your cafeteria tray when you stop suddenly because of
a. the balanced forces acting on the orange. c. the friction forces acting on the orange.
b. the centripetal force acting on the orange. d. the orange’s inertia.
____ 22. According to Newton’s second law of motion, the acceleration of an object equals the net force acting on the
object divided by the object’s
a. mass.
c. velocity.
b. momentum.
d. weight.
____ 23. If a force of 10 N is applied to an object with a mass of 1 kg, the object will accelerate at
a. 0.1 m/s2.
c. 10 m/s2.
2
b. 9 m/s .
d. 11 m/s2.
____ 24. Newton’s third law of motion describes
a. action and reaction forces.
b. balanced forces.
c. centripetal forces.
d. net force.
____ 25. In which of the following are action and reaction forces involved?
a. when a tennis racket strikes a tennis ball c. when rowing a boat
b. when stepping from a curb
d. all of the above
____ 26. The product of an object’s mass and velocity is its
a. centripetal force.
c. net force.
b. momentum.
d. weight.
____ 27. What is conserved when two objects collide in a closed system?
a. acceleration
c. speed
b. momentum
d. velocity
Problem
28. If you ride your bike at an average speed of 2 km/h and need to travel a total distance of 20 km, how long will
it take you to reach your destination? Show your work.
29. A crane exerts a net force of 900 N upward on a 750-kilogram car as the crane starts to lift the car from the
deck of a cargo ship. What is the acceleration of the car during this time? Show your work.
30. A small 32-kilogram canoe broke free of its dock and is now floating downriver at a speed of 2.5 m/s. What is
the canoe’s momentum? Show your work.
Physical Science Unit 1 Test
Answer Section
MULTIPLE CHOICE
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B
B
A
D
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B
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A
C
C
A
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B
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B
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1
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L2
L1
L1
L2
L2
L2
L2
L1
L2
L1
L1
L1
L2
L1
L1
L2
L1
L1
L2
L1
L2
L1
L2
L1
L2
L1
L1
PROBLEM
28. ANS:
PTS: 1
29. ANS:
DIF: L2
OBJ: 11.2.2
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11.1.2
11.1.3
11.1.4
11.1.4
11.2.1
11.2.2
11.2.3
11.2.4
11.2.4
11.3.1
11.3.3
11.3.4
11.3.4
12.1.1
12.1.2
12.1.2
12.1.3
12.1.5
12.1.5
12.2.1
12.2.1
12.2.2
12.2.2
12.3.1
12.3.1
12.3.2
12.3.2
PTS: 1
30. ANS:
DIF: L2
OBJ: 12.2.2
PTS: 1
DIF: L2
OBJ: 12.3.2