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 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. Free-falling objects are experiencing only one force - the force of gravity.

2. When in free-fall, 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 free-fall.

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

5. The net force on a 3-kg free-falling object is 10 N.

6. A free-falling 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 3-yard loss

ad. the fullback falls backwards to the ground

14. Late one night, an unfortunate bug collides with the windshield of a fast-moving 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

Fnet = m * a
Fgrav = m * g
Ffrict = m * Fnorm
a = velocity change/time
d = vi*t + (1/2)*a*t2
vf = vi + a*t
vf2 = vi2 + 2*a*d
d = (vi + vf)/ 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 free-body 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 2-kg object is thrown upwards with an initial velocity of +20 m/s and travels in free-fall 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 free-body 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 1.2-kg purse from the top of the 40-m high Giant Drop. Determine the speed of the free-falling purse just prior to striking the ground. PSAYW

 

 

 

 

 

 

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