Concept explainers
Why does a child in a wagon seem to fall backward when you give the wagon a sharp pull forward?
Does a child in a wagon seems to fall backward when the wagon moves a sharp pull forward.
Answer to Problem 1Q
Yes, a child in a wagon seems to fall backward when you give the wagon a sharp pull forward.
Explanation of Solution
In this case the child and the wagon are initially at rest. The child is sitting or standing in the wagon. His feet or the bottom will contact with the wagon.
When you give a sharp pull forward to the wagon, the child’s bottom part or the feet will moves forward with the wagon. Because the force of friction acts between the child and the wagon.
Conclusion:
In this case, the bottom part of the child begins to move to forward but the upper part of the child follows the Newton’s first law (the law of inertia) and remains stationary. So the child falls backward.
Therefore, the child in a wagon seems to fall backward when we give the wagon a sharp pull forward.
Want to see more full solutions like this?
Chapter 4 Solutions
Modified Mastering Physics with Pearson eText -- Combo Access -- for Physics for Scientist and Engineers (18 week)
Additional Science Textbook Solutions
College Physics: A Strategic Approach (4th Edition)
An Introduction to Thermal Physics
Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (4th Edition)
University Physics (14th Edition)
Lecture- Tutorials for Introductory Astronomy
Conceptual Physics (12th Edition)
- When you are in the front passenger seat of a car turning to the left, you may find yourself pressed against the right-side door. Why do you press against the door? Why does the door press on you? Does your explanation involve a centrifugal force, or Newton’s laws?arrow_forwardWhen a car stops suddenly, the passengers tend to move forward relative to their seats. Why? When a car makes a sharp turn, the passengers tend to slide to one side of the car. Why?arrow_forwardIf you toss a stick into the air, it appears to wobble all over the place. Specifically, about what place does it wobble?arrow_forward
- An office door is given a sharp push and swings open against a pneumatic device that slows the door down and then reverses its motion. At the moment the door is open the widest, (a) does the doorknob have a centripetal acceleration? (b) Does it have a tangential acceleration?arrow_forwardWhy does a pilot tend to black out when pulling out of a steep dive?arrow_forwardA space station, in the form of a wheel 120 m in diameter, rotates to provide an artificial gravity of 3.00 m/s2 for persons who walk around on the inner wall of the outer rim. Find the rate of the wheels rotation in revolutions per minute that will produce this effect.arrow_forward
- The board sandwiched between two other boards in Figure P4.91 weighs 95.5 N. If the coefficient of friction between the boards is 0.663, what must be the magnitude of the compression forces (assumed to be horizontal) acting on both sides of the center board to keep it from slipping? Figure P4.91arrow_forwardA door in a hospital has a pneumatic closer that pulls the door shut such that the doorknob moves with constant speed over most of its path. In this part of its motion, (a) does the doorknob experience a centripetal acceleration? (b) Does it experience a tangential acceleration?arrow_forward*.58 The presence of an unseen planet orbiting a distant star can sometimes be inferred from the motion of the star as we see it. As the star and planet orbit the center of mass of the star-planet system, the star moves toward and away from us with what is called the line of sight velocity, a motion that can be de- tected. Figure 13-49 shows a graph of the line of sight velocity ver- sus time for the star 14 Herculis. The star's mass is believed to be 0.90 of the mass of our Sun. Assume that only one planet orbits the star and that our view is along the plane of the orbit. Then approxi- mate (a) the planet's mass in terms of Jupiter's mass m, and (b) the planet's orbital radius in terms of Earth's orbital radius rE. 70 -70 1500 days Time Line of sight veloxity (m/s)arrow_forward
- if an individual has a mass of 78.8 kg and forearm length of 30.1 cm. What moment does the weight of the arm cause about their elbow?arrow_forwardWhy does a child in a wagon seem to fall back when you give the wagon a sharp full forward? Explain in handwritten.arrow_forwardIf instead the elevator is accelerating upwards at a rate of a = 2.2 m / s^2, what does the scale report as the apparent weight of the person?arrow_forward
- Principles of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningGlencoe Physics: Principles and Problems, Student...PhysicsISBN:9780078807213Author:Paul W. ZitzewitzPublisher:Glencoe/McGraw-HillCollege PhysicsPhysicsISBN:9781285737027Author:Raymond A. Serway, Chris VuillePublisher:Cengage Learning
- Classical Dynamics of Particles and SystemsPhysicsISBN:9780534408961Author:Stephen T. Thornton, Jerry B. MarionPublisher:Cengage Learning