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Unit 2 Quiz#1

1. A 4.0-kg object is moving across a frictionless surface with a constant velocity of 2 m/s. Which one of the following horizontal forces is necessary to maintain this state of motion?

a. 0 N

b. 0.5 N

c. 2.0 N

d. 8.0 N

e. depends on the speed.


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State of Motion (4 seconds)

 

2. The velocities and masses of four objects are given below. Which one of the following objects has the greatest inertia?

  1. 5 kg object moving at 12 m/s
  2. 12 kg object moving at 5 m/s
  3. 21 kg object moving at 3 m/s
  4. 55 kg object which is not moving (v = 0 m/s)


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Inertia and Mass (12 seconds)

 

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

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


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Balanced and Unbalanced Forces (7 seconds)

 

4. A 2.0-kg rock is thrown vertically and then rises towards its peak. Assuming, negligible air resistance, the net force (in Newtons) acting upon the 2.0-kg rock at the top of its trajectory is approximately

a. 0

b. 2

c. 10

d. 20

e. not enough information to calculate


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Drawing Free-Body Diagrams (8 seconds)

Determining the Net Force (11 seconds)

 

5. 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 mass on the moon. Explain your answer or show your calculation.


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Mass vs. Weight (8 seconds)

 

6. A force of F on a mass M causes an acceleration of 12 m/s2. What acceleration will result from a force of 3F on a mass of 0.5*M?


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Newton's Second Law (9 seconds)

 

7. A 20-kg object will encounter a 50-N frictional force when pushed across a horizontal surface. With what force must you push the object in order to maintain a constant velocity? Explain your answer or show your calculation.


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Balanced and Unbalanced Forces (7 seconds)

 

8. Little Billie has a mass of 25-kg. How much force must be applied to Little Billie in order to lift him upward with a constant velocity of 2 m/s? Explain your answer or show your calculation.


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Balanced and Unbalanced Forces (7 seconds)

Weight (8 seconds)

 

9. Construct free-body diagrams for the following two physical situations. Use arrows to show the direction of all forces acting upon the object. Label each arrow according to the type of force.

a. A baseball is moving upwards and rightwards towards the peak of its trajectory. Neglect Fair.

 

b. A rightward moving car is skidding to a stop; the wheels of the car are locked. Neglect Fair.

 

 

 

 

 


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Types of Forces (8 seconds)

Drawing Free-Body Diagrams (8 seconds)

 

10. Consider the following statements and corresponding free-body diagrams. Read the statement and fill in all the blanks in the diagram.

a. A 45-N rightward force is applied to a 20-kg box to accelerate it towards the right across the floor with an acceleration of 0.25 m/s2.

b. An 800-kg unoccupied freight elevator, supported by a large cable, is descending with a constant velocity of 2.0 m/s, down.

Fnet = _______

a = 0.25 m/s2, right

Fnet = _______

a = _______


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Determining the Net Force (11 seconds)

Finding Acceleration (6 seconds)

Finding Individual Forces (7 seconds)

 

11. Velocity-time data for a rightward-moving object is shown in the table below. Use this information to fill in the blanks in the diagram below. (Note: Assume the positive direction is to the right).

Time (s)

Velocity (m/s)

0
16.0 m/s, right
0.5
14.0 m/s, right
1.0
12.0 m/s, right
1.5
10.0 m/s, right
2.0
8.0 m/s, right
2.5
6.0 m/s, right
3.0
4.0 m/s, right


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Acceleration (12 seconds)

Determining the Net Force (11 seconds)

Finding Individual Forces (7 seconds)

 

12. Indicate whether the object in the above problem (#11) has a leftward, a rightward, or no acceleration. Explain your answer.


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Acceleration (12 seconds)

 

13. A group of Glenview youngsters went sledding. Lee Mealone was frustrated with the group and began to run ahead. As he pulled his 15.0 kg sled, he applied a horizontal force of 25.0 N (rightward). The coefficient of sliding friction (mu) between the the snow and the sled is 0.15. 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. Please circle, box, or underline your answer. PSYW


Useful Web Links

Determining the Net Force (11 seconds)

Finding Acceleration (6 seconds)

Finding Individual Forces (7 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.