Exam 4 Target 1 Retake Preap 16-17

Reviewed by Editorial Team
The ProProfs editorial team is comprised of experienced subject matter experts. They've collectively created over 10,000 quizzes and lessons, serving over 100 million users. Our team includes in-house content moderators and subject matter experts, as well as a global network of rigorously trained contributors. All adhere to our comprehensive editorial guidelines, ensuring the delivery of high-quality content.
Learn about Our Editorial Process
| By Sfduke
S
Sfduke
Community Contributor
Quizzes Created: 51 | Total Attempts: 7,946
| Attempts: 77
Quiz Flashcard
SettingsSettings
Please wait...
  • 1/5 Questions

    In which of the following sentences is work used in the scientific sense of the word?

    • A. Holding a heavy box requires a lot of work.
    • B. A scientist works on an experiment in the laboratory.
    • C. Sam and Rachel pushed hard, but they could do no work on the car.
    • D. John learned that shoveling snow is hard work.
Please wait...
About This Quiz

This quiz assesses understanding of work and energy concepts in physics, focusing on scenarios like lifting objects, parachuting, and the scientific definition of work.

Physics Quizzes & Trivia

Quiz Preview

  • 2. 

    Work is done when

    • A. the displacement is not zero.

    • B. the displacement is zero.

    • C. the force is zero.

    • D. the force and displacement are perpendicular.

    Correct Answer
    A. A. the displacement is not zero.
    Explanation
    Work is done when the displacement is not zero because work is defined as the transfer of energy that occurs when a force is applied to an object and it causes the object to move. If the displacement is zero, it means that there is no movement of the object and therefore no work is being done. However, if the displacement is not zero, it indicates that the object is being moved and work is being done on it.

    Rate this question:

  • 3. 

    If the sign of work is negative,

    • A. the force is in the same direction as the displacement.

    • B. the force is perpendicular to the displacement.

    • C. the component of the force that does work is in the direction opposite the displacement.

    • D. the component of the force that does work is perpendicular to the displacement.

    Correct Answer
    A. C. the component of the force that does work is in the direction opposite the displacement.
    Explanation
    When the sign of work is negative, it indicates that the work done by the force is in the opposite direction of the displacement. This means that the component of the force that actually performs work is acting against the displacement, rather than in the same direction or perpendicular to it. Therefore, option c is the correct explanation.

    Rate this question:

  • 4. 

    A painter lifts a bucket of paint, carries it 5 m horizontally then sets it back down. Which of the following is true?

    • A. The force of gravity does negative work when the worker lifts the bucket.

    • B. The painter does positive work on the bucket when carrying it horizontally at constant speed.

    • C. The painter does positive work on the bucket when setting it down.

    Correct Answer
    A. A. The force of gravity does negative work when the worker lifts the bucket.
    Explanation
    When the painter lifts the bucket of paint, they are exerting an upward force against the force of gravity. Since the displacement is in the same direction as the force applied, the work done by the painter is positive. However, the force of gravity is acting in the opposite direction to the displacement, so it does negative work on the bucket. Therefore, option a is correct.

    Rate this question:

  • 5. 

    A parachutist falls at a constant speed for 200 m. Which of the following is true?

    • A. The force of gravity is the only force doing work on the parachutist.

    • B. Air resistance is the only force doing work on the parachutist.

    • C. No forces are doing work on the parachutist.

    • D. No net work is done on the parachutist.

    Correct Answer
    A. D. No net work is done on the parachutist.
    Explanation
    When a parachutist falls at a constant speed, it means that the forces acting on the parachutist are balanced. Gravity pulls the parachutist downwards, while air resistance pushes against the motion, opposing the force of gravity. Since the parachutist is falling at a constant speed, the forces of gravity and air resistance are equal and opposite, resulting in no net force. When there is no net force, no work is done on the parachutist because work is defined as the product of force and displacement in the direction of the force. Therefore, the correct answer is d. No net work is done on the parachutist.

    Rate this question:

Quiz Review Timeline (Updated): Mar 21, 2023 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Oct 06, 2015
    Quiz Created by
    Sfduke
Back to Top Back to top
Advertisement
×

Wait!
Here's an interesting quiz for you.

We have other quizzes matching your interest.