

Free
Fall, Air Resistance and Newton's Laws Quiz
2001
The following statements pertain to the concept of free
fall. Identify the statements as true (A) or false (B) by
placing the appropriate letter in the blank and/or your
ScanTron sheet.
T or F?

Statement


1. Freefalling objects are experiencing only
one force  the force of gravity.


2. When in freefall, a feather experiences the
same force of gravity as an elephant.


3. An elephant weighs more than a feather, yet
experiences the same acceleration when in
freefall.


4. The acceleration experienced by freefalling
objects is dependent upon the object's mass.
Object's of different mass accelerate at different
rates.


5. The net force on a 3kg freefalling object
is 10 N.


6. A freefalling object will change its speed
by approximately 10 m/s every second.

The following statements pertain to air resistance and
terminal velocity. Identify the statements as true (A)
or false (B) by placing the appropriate letter in
the blank and/or your ScanTron
sheet.
T or F?

Statement


7. As an object increases its speed, the amount
of air resistance decreases.


8. A falling elephant will experience more air
resistance than a falling feather.


9. A parachute slows a skydiver down because it
has less mass once opened.


10. An object which has reached a terminal
velocity is still accelerating.


11. Once terminal velocity is reached by a
skydiver, the force of air resistance is equal to
the object's mass times the acceleration of
gravity.

12. Bronco Brown the skydiver pulls the chord of
his parachute. The forces acting upon Bronco and
his parachute are shown in the diagram at the
right. From this diagram, one might infer that
____. Bubble in all that apply:
a. Bronco will be accelerating
upwards.

b. Bronco will immediately stop.

c. Bronco will begin moving
upwards.

d. Bronco will continue to fall, but
now will slow down.

e. None of these will occur



13. A linebacker strikes a fullback with full force in a
football game. The reaction force to the force of the
linebacker striking the fullback is
____.
a. the sound of the pads colliding

b. the force of the fullback colliding with the
ground

c. the fullback fumbles

d. the fullback applies a force to the
linebacker

e. the linebacker applies a force to himself

ab. the fullback applies a force to himelf

ac. there is a 3yard loss

ad. the fullback falls backwards to the
ground

14. Late one night, an unfortunate bug collides with the
windshield of a fastmoving bus. The force of the bus on the
bug is _____ the force of the bug on the bus; the resulting
acceleration of the bug is ____ the acceleration of the
bus.
a. greater than, greater than

b. greater than, less than

c. greater than, equal to

d. equal to, equal to

e. equal to, greater than

ab. equal to, less than

ac. less than, less than

ad. less than, greater than

ae. less than, equal to


F_{net }= m * a

F_{grav }= m * g

F_{frict }= m *
F_{norm}

a = velocity change/time

d = v_{i}*t +
(1/2)*a*t^{2}

v_{f} = v_{i} +
a*t

v_{f}^{2} =
v_{i}^{2 }+ 2*a*d

d = (v_{i} + v_{f})/ 2*
t

15. A boy pulls his 9.0 kg sled, applying a horizontal
force of 14.0 N (rightward). The coefficient of friction
between the snow and the sled is 0.12. Determine the net
force and the acceleration of the sled. To receive credit:
Draw a freebody diagram for the sled; use appropriate force
symbols to label the type of each force acting on the sled.
Please circle, box, or underline your answers.
PSAYW
16. A 2kg object is thrown upwards with an
initial velocity of +20 m/s and travels in
freefall motion.
a. In the space at the right, diagram
the forces acting upon the ball after it
leaves the hand of the thrower. As in all
freebody diagrams, label every force
according to type.

b. Calculate the acceleration of the
ball. PSYW

c. Calculate the speed of the ball
after 3.0 seconds. PSYW

d. Calculate the distance traveled
after 4.0 seconds. PSYW


FBD:

17. In a moment of extreme fear, Rachel drops her 1.2kg
purse from the top of the 40m high Giant Drop. Determine
the speed of the freefalling purse just prior to
striking the ground. PSAYW
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Last updated on 9/2/04.
