# What is a projectile by chenboying

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• pg 1
```									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.
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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