Conceptual Physics: The High School Physics Program
Conceptual Physics: The High School Physics Program
9th Edition
ISBN: 9780133647495
Author: Paul G. Hewitt
Publisher: Prentice Hall
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Textbook Question
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Chapter 2, Problem 27A

When a box of chocolate bars is in mechanical equilibrium, what can be correctly said about all the forces that act on it? Must the net force necessarily be zero?

Expert Solution & Answer
Check Mark
To determine

What can be said about all the forces on the chocolate box that is in mechanical equilibrium. And, if the net force on it is necessarily zero.

Answer to Problem 27A

All the forces on the considered chocolate box is balanced, that is equal and opposite. And, yes the net force on that box must be zero if it is in mechanical equilibrium.

Explanation of Solution

Introduction:

An equilibrium is basically a state of no change in the state of the object.

Thus, if the object is in equilibrium, then there will be zero net force on it, that is,

  F=0

But it does not mean that the forces on it zero, it means that all the forces acting on it are equal and opposite which cancels each other to make the net force zero.

Conclusion:

Hence, the given chocolate box can be in equilibrium even when the forces act on it which are equal and opposite.

Chapter 2 Solutions

Conceptual Physics: The High School Physics Program

Ch. 2 - What is the angle between a support force and the...Ch. 2 - What two forces compress a spring inside a...Ch. 2 - When you are at rest and supported by a pair of...Ch. 2 - Can an object be moving and still be in...Ch. 2 - If you push a crate across a factory floor at...Ch. 2 - Prob. 16ACh. 2 - According to the parallelogram rule for two...Ch. 2 - Consider the suspension of Nellie in Figure 2.11....Ch. 2 - Consider Nellie in Figure 2.12. What changes in...Ch. 2 - When Nellie hangs from ropes at different angles,...Ch. 2 - Blocks A and B are supported by the table. Block C...Ch. 2 - In the diagram below, identical blocks are...Ch. 2 - Burl and Paul stand on their sign-painting...Ch. 2 - Percy does gymnastics, suspended by one rope in A...Ch. 2 - A cat lies on the floor. Can you say that no force...Ch. 2 - Consider two forces, one having a magnitude of 20...Ch. 2 - When a box of chocolate bars is in mechanical...Ch. 2 - Faina says that an object cannot be in mechanical...Ch. 2 - Phyllis Physics hangs at rest from the ends of the...Ch. 2 - Harry the painter swings year after year from his...Ch. 2 - How many significant forces act on a your physics...Ch. 2 - Why doesnt the support force that acts on a book...Ch. 2 - Nicole stands on a bathroom scale and reads her...Ch. 2 - Justin sets a hockey puck sliding across the ice...Ch. 2 - Alyssa pulls horizontally on a crate with a force...Ch. 2 - Consider a heavy refrigerator at rest on a kitchen...Ch. 2 - Sneezlee is supported by two thin wires. Is the...Ch. 2 - Sneezlees wire supports are repositioned as shown....Ch. 2 - If a picture frame were supported by a pair of...Ch. 2 - A monkey hangs by a strand of rope and holds onto...Ch. 2 - Why cant the strong man pull hard enough to make...Ch. 2 - Two vertical chains are used to hold up a 1000-N...Ch. 2 - Lucy Lightweight stands with one foot on one...Ch. 2 - Harry Heavyweight, who weighs 1200 N, stands on a...Ch. 2 - The sketch shows a painters staging in mechanical...Ch. 2 - A staging that weighs 300 N supports two painters,...Ch. 2 - Two children push on a heavy crate that rests on a...Ch. 2 - Two children push on a crate. They find that when...
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