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What is a projectile

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					What is a projectile?
a.   any object that is thrown
b.   an object that has multiple
     forces acting upon it
c.   an object that has only the
     force of gravity acting upon it
d.   none of the above
An example of projectile
motion is (neglecting air
     resistance)...
 a.   a golf ball being hit
 b.   A water fountain
 c.   A stomp rocket
 d.   All of the above
 A projectile will follow a
parabolic path because...
 a.   The force of gravity acting
      upon it.
 b.   It loses speed.
 c.   It no longer accelerates.
 d.   All of the above.
The definition of range
         is...
 a.   the horizontal distance
      traveled of a projectile
 b.   how fast a projectile is moving
 c.   the amount of time a
      projectile is in air
 d.   None of the above.
 A water balloon is dropped from the top of the school
and is seen to land on the ground 5 seconds after it was
  released. Approximately how high is the top of the

                        school?



    a.    19.6 m
    b.    44.1 m
    c.    78.4 m
    d.    122.5 m
Stephen shoots a cannonball horizontally off the
  top of his house. The ball hits the ground 3

     seconds later. How tall is his house?


    a.   19.6 m
    b.   44.1 m
    c.   78.4 m
    d.   122.5 m
Imagine yourself throwing a football
 at various angles; if you wanted to
 throw the ball as far as you could
  which angle would you throw it?

  a.   20   degrees
  b.   30   degrees
  c.   45   degrees
  d.   60   degrees
The game is tied, 7-7 and Weak-
Arm-Willy is quarterback. What do
we, the teammates, advise Willy
about making a long pass?
 a.   Wait 3 seconds then throw the ball.
 b.   Throw the ball as hard as you can at an
      angle of 45 degrees.
 c.   Wait until you get sacked and then
      sneak me the ball.
 d.   Give the ball to James and let him punt
      it (soccer does have its advantages)
It's the last game of the season…, October 27th , and
it's snowing. Actually, it seems more like a blizzard with
how hard the wind is blowing. But, we are the dedicated
team and are going to get the game in. What do we

need to consider when playing the game?

     a.   The team throwing against
          the wind has the advantage.
     b.   The team throwing with the
          wind has the advantage.
     c.   The football will act as nothing
          is different.
For projectiles thrown at an angle, and considering air resistance to
be negligible, which of the following is true:
a. The horizontal component of the velocity is constant
b. The acceleration decreases as the projectile moves upward.
c. The vertical speed is minimum at the highest point in its
trajectory.
d. The acceleration is zero at the highest point in its trajectory.

 a.    A   and       D
 b.    B   and       C
 c.    C   and       D
 d.    A   and       C
Emily runs straight off a cliff with a
horizontal velocity of 3.35 m/s and falls for
2.12s before landing on the ground. What
is the horizontal component of her velocity
(in m/s) just before she reaches the
ground?
 a.   11.66 m/s
 b.   2.35 m/s
 c.   3.35 m/s
 d.   4.35 m/s
Christina runs straight off a cliff with
a horizontal velocity of 2.18 m/s and
falls for 1.19s before landing on the
ground. What is the vertical
component of her velocity (in m/s)
just before she hits the ground?

 a.   11.66 m/s
 b.   2.35 m/s
 c.   3.35 m/s
 d.   4.35 m/s
The vertical velocity of a
horizontally launched
projectile
a.   increases each second by 10
     m/s.
b.   decreases each second by 10
     m/s.
c.   is constant and remains the
     same.
A rock is thrown horizontally from
the top of a cliff with an initial
speed of 12 m/s. If the rock hits
the ground after 2.0 s what is the
height of the cliff?

a.   9.8 m
b.   19.6 m
c.   29.4 m
d.   39.2 m
 Rebecca throws a tennis ball
 horizontally at an initial velocity of
 15 meters/second from a top of a
 cliff 44 meters high. It will take
 ___ seconds for the tennis ball to
 hit the ground.
a.   1.5
b.   3
c.   4.5
d.   6
 If the initial velocity of a
 projectile is doubled, it's
 range will be
a.   Doubled
b.   Decreased by a factor of two.
c.   Quadrupled.
d.   Decreased by a factor of four.
A rude tourist throws a peach pit
horizontally with a 7.0 m/s velocity
off the balcony of a restaurant.
Determine how far the pit will travel
horizontally before it strikes the
ground 15 m below.

a.   105 m
b.   2.14 m
c.   9.58 m
d.   12.24 m
          The diagram at the right depict the trajectory of a projectile;
           the position of the projectile after each consecutive second
           is shown. The arrows depict the horizontal and vertical
           components of the velocity. Use your understanding of

          projectiles to find the horizontal velocity at t = 4 s.



a.   10   m/s
b.   20   m/s
c.   30   m/s
d.   40   m/s
          The diagram at the right depict the trajectory of a projectile;
           the position of the projectile after each consecutive second
           is shown. The arrows depict the horizontal and vertical
           components of the velocity. Use your understanding of

          projectiles to find the vertical velocity at t = 3 s.



a.   10   m/s
b.   20   m/s
c.   30   m/s
d.   40   m/s
A golfer drives her golf ball from the tee
     down the fairway in a high arcing
     shot. When the ball is
     at the highest point of its flight:
a.   the velocity and acceleration are both
     zero
b.   the x-velocity is zero and the y-velocity
     is zero
c.   the x-velocity is constant and the y-
     velocity is zero
d.   the velocity is non-zero and the
     acceleration is zero
In the “Bull’s Eye” lab the ball rolled
     off the table. What was the initial
     vertical velocity of
     the ball when it left the table?
 a.   depends on the initial x-velocity
 b.   Depends on the size of the ball
 c.   Unknown; it must be measured
 d.   0 m/s
For a projectile, what is the
     acceleration in the x-direction?
a.   depends on initial velocity
b.   0
c.   Depends on how long it is in the air.
d.   Depends on the y-acceleration.
A bullet is fired horizontally from a
    gun. At the same time a similar
    bullet is dropped from the
    same height. The fired bullet
    will:
a.   Hit the ground first
b.   Hit the ground second
c.   Hit the ground at the same time as the
     dropped bullet
d.   Never hit the ground
 A mortar shell is fired from the
     ground at an angle of 60
     degrees from the horizontal and
     with an initial velocity of 200
     m/s. What is the vertical velocity
     of the shell?
a.   51.96 m/s
b.   173.2 m/s
c.   31.96 m/s
d.   50 m/s
         A bullet is fired at an angle of 45
         degrees. Neglecting air resistance,
         what is the direction of acceleration
         during the flight of the bullet?

a.   Upward
b.   Downward
c.   At an angle of 45 degrees.
d.   Dependent upon the intitial
     velocity.

				
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