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Unit 4 and 5 Test Review
1. Which one of the following quantities is not a vector?
a. Velocity
b. Acceleration
c.
Distance
d. Displacement
2. If given the same velocity for each, which will travel a greater horizontal distance:
a bullet shot horizontally or a bullet shot at an angle of 45 degrees?
3. A baseball was thrown with an initial velocity of 20. m/s at an angle above the
horizontal. It remained in the air for 4.0 s. What will always remain
constant while the baseball is in the air?
4. A student is attempting to hit a target 3.0 m from the edge of a desk that is 2.0 m tall. If
the marble rolls off a table horizontally, what velocity must the marble have to strike the target?
5. A pitcher throws a fastball horizontally toward home plate 16.0 meters away. If the
ball is traveling at a speed of 35.0 m/s, neglecting air friction, how long does it take
for the ball to get to home plate?
6. A projectile is shot horizontally off a cliff at a speed of 15 m/s, hitting the ground 2.0 seconds later.
a. At what horizontal distance from the base of the cliff did the projectile land?
b. What is the height of the cliff?
7. Rock A is thrown horizontally off of a cliff with a velocity of 15 m/s. The rock lands 40.
m from the base of the cliff.
a. How long will Rock A be in the air?
b. What is the height of the cliff?
c. What is the magnitude of velocity for the horizontal component just before Rock A
strikes the ground?
d. What is the magnitude of the vertical acceleration for Rock A after it is released?
e. A second rock (Rock B) is thrown from the same height from which Rock A was
thrown. If both rocks are released simultaneously, which rock will strike the ground first?
8. A student throws a baseball at 30 m/s upward at 60 degrees above the horizontal. The diagram
represents the position of the ball while in flight.
a. What position will have the greatest magnitude of vertical acceleration?
b. What position will have the smallest magnitude of vertical velocity?
c. What will the baseball’s horizontal velocity be?
d. The student can maximize the horizontal displacement of the baseball by changing the
angle to what degree?
e. The student would like to increase the flight time of the baseball without changing the
angle the ball is released. What can the student do to increase the flight time of the ball?
9. A ball is tossed upward to a height of 11 m and falls back to its original position. The total trip
up and down is exactly 3.0 seconds.
Fill in the blanks with values for the following quantities, including units. (Upward is considered
to be a positive direction.)
a. __
______ time spent falling
b. __
______ time spent rising
c.
______ acceleration, down trip
__
d. _
_______ acceleration, up trip
e. _
_______ speed at the top
f. _____
___ acceleration at the top
10. A student discovers a comet heading toward the sun. The student records the initial
distance from the sun as ‘d’ while recording the initial mass of the comet as ‘m’ which
resulted in a gravitational force of ‘F’. Further observation of the comet shows that as
it reaches a position d/2, the mass of the comet has been reduced to m/3.
a. The action force is the gravitational pull attracting the comet to the Sun. Which best
represents the reaction force?
b. What is the gravitational force between two identical 6000. kg asteroids whose
centers of mass are separated by 200. m?
11. USE THE FOLLOWING INFORMATION FOR THE NEXT TWO QUESTIONS.
a. Besides gravity, what was Newton’s big idea?
b. The concept of an object seeking its “natural place” was first proposed by which scientist?