Student Email: 1024885@wells-school.com
Site Title: Pearson Physics - Welcome to the eTest Companion Site
Location on Site: U3: Circular Motion, Work, and Energy > Chapter 6 > Section 6.1 eTest
50% Correct of 10 Scored items:
5 correct: 50%
5 incorrect: 50%
Submitted on November 15, 2012 at 1:44 AM (UTC/GMT)
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Question 1
Use the following information to answer the next 2 questions.
A helicopter flies you to a remote mountaintop. You pause to enjoy the view and then ski down to the bottom of the mountain.
Which of the following best describes the transfer of energy involved as you ski down the mountain?
Correct: Gravitational potential energy is converted to kinetic energy.
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Question 2
Which of the following best describes the change in energy involved in getting to the top of the mountain?
Incorrect: Work is done by the helicopter, resulting in an increase in kinetic energy.
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Question 3
A child is trying to push her toy box across the floor. She first pushes down on it at an angle and it does not move. She then pushes against it in the direction she wants it to go and it moves easily. Which choice describes this situation?
Correct: A force applied parallel to a displacement does the most work.
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Question 4
A man picks up an 8-kg cat and then holds it to his chest. Which statement about this situation is true?
Incorrect: You need to know how high he lifted the cat to calculate the force required to lift it.
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Question 5
An experiment involves placing a toy car at the top of a frictionless ramp in a backyard. Which statement below about this situation is false?
Incorrect: The change in potential energy would be the same if the experiment were repeated on the second-storey level of the house instead of the backyard.
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Question 6
A marble weighing 3.00 g rolls down a marble run from a height of 1.00 m to ground level. Which of the following represents the potential energy the marble has lost?
Incorrect: 29.4 J
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Question 7
The following graph represents the relationship between force and position for a mass suspended on a spring.
Which of the following best describes the relationship between force and position for this spring?
Correct: The slope of the line represents the spring constant.
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Question 8
Use the following information to answer the next 2 questions.
Old-style pinball machines are equipped with a spring for launching the ball into the machine.
Which of the following best describes when the spring is pulled back all the way and held, just before launching the ball?
Correct: The potential energy of the spring is at a maximum.
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Question 9
The pinball machine is equipped with a spring that has a relatively high spring constant. Which of the following statements regarding spring constants is false?
Incorrect: To calculate the force required to stretch a spring, a weight can be hung from the spring in a vertical position.
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Question 10
Two similarly constructed cars are set up to collide with a brick wall. One car is 2000 kg and will travel at 20 m/s. The other car is 4000 kg and will travel at 10 m/s. Which car will damage the wall the most, and why?
Correct: The 2000-kg car will do more damage to the wall because it has more kinetic energy.
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