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Unit 2 Quiz#2

1. If the forces acting upon an object are balanced, then the object

  1. must not be accelerating.
  2. must be moving with a constant velocity.
  3. must not be moving.
  4. none of these


Useful Web Links

Newton's First Law (10 seconds)

Balanced and Unbalanced Forces (7 seconds)

 

2. Big Bubba has a mass of 1000 kg. The acceleration of gravity on the moon is one-sixth of the value on Earth. Determine Big Bubba's weight on the moon. Explain your answer or show your calculation.


Useful Web Links

Mass vs. Weight (8 seconds)

 

3. A force of F on a mass M causes an acceleration of 15 m/s2. What acceleration will result from a force of (1/3)F on a mass of 4M?


Useful Web Links

Newton's Second Law (9 seconds)

 

4. Bronco Brown (m = 80 kg) is skydiving and he drops from an airplane from 3000 meters. Determine Bronco Brown's acceleration after 6.6 seconds when the force of air resistance upon his body is 550 N. Draw a free-body diagram in the space at the right (representing the forces by arrows and labeling them according to their type) and show all your work below. Please underline or box your answer.

FBD:


Useful Web Links

Drawing Free-Body Diagrams (8 seconds)

Finding Acceleration (6 seconds)

Free Fall and Air Resistance (12 seconds)

 

5. Bronco Brown (m = 80 kg) is skydiving and he drops from an airplane from 3000 meters. Determine Bronco Brown's acceleration 2.8 seconds after opening his parachute when the force of air resistance upon his body is 1150 N. Draw a free-body diagram in the space at the right (representing the forces by arrows and labeling them according to their type) and show all your work below. Please underline or box your answer.

FBD:


Useful Web Links

Drawing Free-Body Diagrams (8 seconds)

Finding Acceleration (6 seconds)

Free Fall and Air Resistance (12 seconds)

 

6. A 0.450-kg baseball is moving upwards and rightwards towards the peak of its trajectory. Neglect Fair. Determine the acceleration of the baseball. Draw a free-body diagram in the space at the right (representing the forces by arrows and labeling them according to their type) and show all your work below. Please underline or box your answer.

FBD:


Useful Web Links

Drawing Free-Body Diagrams (8 seconds)

Finding Acceleration (6 seconds)

Free Fall and Air Resistance (12 seconds)

 

7. If an elephant and a feather are dropped from a tall building, the elephant reaches the ground first. Which one of the following statements are true of the motion of the elephant and the feaher? Mark each statement as T or F.

  1. The elephant reaches the ground first. The amount of air resistance which it experiences is greater than the feather's; yet Fair makes little impact on the elephant's motion due to its large weight.
  2. The elephant reaches the ground first because it experiences a greater acceleration of gravity compared to the feather.
  3. The feather reaches the ground last even though it experiences less air resistance compared to the elephant.
  4. The elephant reaches the ground first; it spends more time accelerating to its terminal velocity, thus reaching a larger terminal velocity value than the feather.


Useful Web Links

Free Fall and Air Resistance (12 seconds)

Elephant and Feather Animation

 

8. A small bug and a large bus have a head-on collision. Which object (bug, bus or both the same) experiences the greatest force? _______________ Explain your answer.


Useful Web Links

Newton's Third Law (10 seconds)

 

9. A group of Glenview youngsters went sledding. Lee Mealone was frustrated with the group and began to run ahead. As he pulled his 11.0 kg sled, he applied a horizontal force of 14.0 N (rightward). The coefficient of sliding friction (mu) between the the snow and the sled is 0.10. 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. Determine the acceleration of the sled. If the sled is accelerated from rest, determine its velocity after 3.2 seconds. Please circle, box, or underline your answers. PSAYW


Useful Web Links

Drawing Free-Body Diagrams (8 seconds)

Finding Acceleration (6 seconds)

Kinematic Equations and Problem-Solving (7 seconds)

 

10. An 800-kg car is moving 24.0 m/s when it slams on the brakes. The wheels lock and the car skids across the asphalt for a distance of 34.0 meters before it finally stops. Draw a free-body diagram for the skidding car (label all forces according to type) and determine the coefficient of sliding friction (mu) between the car and the asphalt. PSAYW


Useful Web Links

Kinematic Equations and Problem-Solving (7 seconds)

Drawing Free-Body Diagrams (8 seconds)

Finding Individual Forces (7 seconds)

Coefficient of Friction (8 seconds)

 

 

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The Newton's laws quiz always targets in numerous ways student misconceptions concerning force and motion. Do yourself a favor and spend some time with the following instructional page:

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The Big Misconception (9 seconds)

 

 

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© Tom Henderson, 1996-1999


Glenbrook South High School.

Last updated on 12/14/98.