/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Problem 15 The basic difference between ins... [FREE SOLUTION] | 91影视

91影视

Log out

Learning Materials

Features

Discover

Chapter 2: Problem 15

The basic difference between instantaneous and average speed is that a. instantaneous speed is always faster than average speed. b. average speed is for a total distance over a total time of trip. c. average speed is the sum of two instantaneous speeds, divided by 2 . d. the final instantaneous speed is always the fastest speed.

Short Answer

Expert verified
Option B is correct.

Step by step solution

01

Understanding the Definitions

Instantaneous speed refers to the speed of an object at a particular moment in time. It is often assessed using a speedometer or during a very short interval of time. Average speed, on the other hand, is calculated over a longer period by taking the total distance covered divided by the total time taken.
02

Evaluating Option A

Option A states that instantaneous speed is always faster than average speed. This is not necessarily true as instantaneous speed could be less or more than the average speed depending on the time and situation during the journey.
03

Evaluating Option B

Option B mentions that average speed is for a total distance over a total time of the trip. This is the definition of average speed: it is the total distance traveled divided by the total time taken for the journey. Therefore, this statement is correct.
04

Evaluating Option C

Option C states that average speed is the sum of two instantaneous speeds divided by 2. This is incorrect because average speed is not calculated using just two instances of time or speed, but over the entire journey.
05

Evaluating Option D

Option D claims that the final instantaneous speed is always the fastest speed. This is incorrect as the final speed may not be the highest speed reached during the journey.
06

Conclusion

The correct answer is Option B, as it accurately describes the definition of average speed in relation to instantaneous speed.

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Over 30 million students worldwide already upgrade their learning with 91影视!

Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Understanding Average Speed
Average speed is a fundamental concept in physics, often used to describe how fast something is moving over a period of time. It's determined by dividing the total distance traveled by the total time taken. This gives a simple overall measure of speed, irrespective of whether the object may have traveled faster or slower at various points in the journey. Think of it like this:
  • If you drive 300 kilometers in 3 hours, your average speed would be 100 km/h.
  • It's important because it allows us to make quick sense of travel over longer distances and times.
Average speed doesn鈥檛 reflect changes in speed during the trip鈥攊t鈥檚 just a measure of the overall journey. Keep this in mind when solving physics problems because it's easy to confuse average speed with instantaneous speed.
The Dynamics of Distance and Time
Distance and time are directly linked to speed. The formula for speed calculation is quite straightforward: \[ \text{Speed} = \frac{\text{Distance}}{\text{Time}} \] Let's break this down:
  • "Distance" refers to how far something travels. It's measured in meters, kilometers, or miles, depending on your system of measurement.
  • "Time" is how long the journey takes, typically in seconds, minutes, or hours.
Understanding this relationship is crucial for physics education because it lays the groundwork for more complex topics. When you get these basics right, solving problems becomes much easier.
Mastering Speed Calculation
Speed calculation is an essential skill in physics. It's crucial to understand that speed can refer to both average speed over a distance and time, as well as instantaneous speed at a given moment. Here鈥檚 how you can easily calculate speed:
  • For average speed, use the formula already mentioned: \[ \text{Average Speed} = \frac{\text{Total Distance}}{\text{Total Time}} \]
  • Instantaneous speed requires measurements at a specific moment, often done using tools like speedometers.
  • Always keep an eye on the units; coverting units might be necessary, such as from meters per second to kilometers per hour.
Accuracy in these calculations ensures a deeper understanding of motion, which is fundamental in physics education.
Enhancing Physics Education Through Real-World Application
Physics education strives to connect theoretical concepts to real-world experiences. Learning about speed鈥攂oth average and instantaneous鈥攆orms a foundational part of understanding motion and dynamics. Here's why it matters:
  • It explains everyday phenomena, such as how vehicles operate or the mechanics behind sports.
  • Tackling practical examples, like timing a race or measuring driving energy consumption, illuminates the practical use of speed calculations.
  • Once you grasp speed, diving into more intricate topics becomes easier. Grasping these concepts builds a "physics mindset," crucial in many scientific and engineering fields.
By repeatedly relating core principles to real-life scenarios, physics education becomes more engaging and comprehensive, broadening students' understanding.

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

An orbiting satellite is moved from 10,000 to \(30,000 \mathrm{~km}\) from Earth. This will result in what change in the gravitational attraction between Earth and the satellite? a. None-the attraction is the same. b. One-half as much. c. One-fourth as much. d. One-ninth as much.

Ignoring air resistance, an object falling near the surface of Earth has an acceleration that is a. constant. b. increasing. c. decreasing. d. dependent on the weight of the object.

A ball rolling across the floor slows to a stop because a. there is a net force acting on it. b. the force that started it moving wears out. c. the forces are balanced. d. the net force equals zero.

Which metric unit is used to express a measure of weight? a. \(\mathrm{kg}\) b. J c. \(\mathrm{N}\) d. \(\mathrm{m} / \mathrm{s}^{2}\)

Once again you are at rest with a grocery cart at the supermarket when you apply a certain force to the cart for a short time and acquire a certain speed. Suppose you had bought more groceries, enough to double the mass of the groceries and cart. Neglecting friction, doubling the mass would have what effect on the resulting final speed if you used the same force for the same length of time? The new final speed would be a. one-fourth. b. one-half. c. doubled. d. quadrupled.
See all solutions

Recommended explanations on Physics Textbooks

Further Mechanics and Thermal Physics

Read Explanation

Electromagnetism

Read Explanation

Electricity

Read Explanation

Fluids

Read Explanation

Modern Physics

Read Explanation

Scientific Method Physics

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.