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Unit 2 Quiz#1

Equations:

Fgrav = m*g
Fnet = m*a
a = (Change in vel)/time

Ffrict = "mu" * Fnorm
ave. vel. = displacement/time
g = 10 m/s/s (on Earth)

 

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?

  1. 0 N
  2. 0.5 N
  3. 2.0 N
  4. 8.0 N
  5. depends on the speed.

 


Useful Web Links

Newton's First Law (10 seconds)

Inertia and Mass (12 seconds)

State of Motion (4 seconds)

 

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

 


Useful Web Links

Inertia and Mass (8 seconds)

 

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

A 20-kg box is gliding towards the right across the floor with an acceleration of 1 m/s2, left.

Fnet = _______

a = 1 m/s2, left

An 800-kg unoccupied elevator, supported by a large cable, is ascending upward with a constant velocity of 1.0 m/s, up.

Fnet = _______

a = _______


Useful Web Links

Types of Forces (8 seconds)

Drawing Free-Body Diagrams (8 seconds)

Determining the Net Force (11 seconds)

Finding Acceleration (6 seconds)

 

4. What is the mass of a 6.0 kg object on the moon if the force of gravity on the moon is one-sixth that of the Earth? Explain your answer.

 


Useful Web Links

Mass vs. Weight (8 seconds)

 

5. A force of F on a mass M causes an acceleration of 8 m/s2. What acceleration will result from a force of 2 * F on a mass of one-fourth M?


Useful Web Links

Newton's Second Law (9 seconds)

 

6. 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)

0 s

0.5 s

1.0 s

1.5 s

2.0 s

2.5 s

3.0 s

Velocity (m/s)

16.0 m/s, right

14.0 m/s, right

12.0 m/s, right

10.0 m/s, right

8.0 m/s, right

6.0 m/s, right

4.0 m/s, right

 


Useful Web Links

Acceleration (12 seconds)

Newton's Second Law (9 seconds)

Finding Individual Forces (7 seconds)

 

7. Anna Litical applies a 20.0 N-force to a 10.0 kg-box in order to accelerate at 0.300 m/s2. Draw a free body diagram, using arrows to show all the forces acting upon the box. Label each force according to its type. Label the magnitude of each force. Determine the value of the frictional force acting upon the box. Finally, construct the velocity-time graph for this object's motion. PSYW

 

 


Useful Web Links

The Meaning of Slope for a v-t Graph (9 seconds)

Types of Forces (8 seconds)

Drawing Free-Body Diagrams (8 seconds)

Finding Individual Forces (7 seconds)

 

8. A group of Glenview youngsters went sledding. Lee Mealone was frustrated with the group and began to run ahead at a constant acceleration. As he pulled his 10.0-kg sled, he applied a horizontal force of 12.0 N. The coefficient of sliding friction between the the snow and the sled is 0.10. To receive credit: Draw a free-body diagram for the sled. Label each force acting on the sled. Determine the acceleration of the sled.

 


Useful Web Links

Types of Forces (8 seconds)

Friction Force (8 seconds)

Drawing Free-Body Diagrams (8 seconds)

Finding Individual Forces (7 seconds)

Finding Acceleration (6 seconds)

 

 

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Last updated on 9/25/98.