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2. Motion in One Dimension

Motion is defined as the change in the position of a body concerning time and a reference point. This chapter explores key concepts of linear motion, including important terms like distance, displacement, speed, and velocity, as well as graphical representations of motion and the equations governing uniformly accelerated motion, including free fall under gravity.

Sections

Motion in One Dimension

This section introduces the concept of motion in one dimension, covering types, important terms, and various calculations related to motion, such as speed, velocity, and acceleration.

2 Section Overview

Start current section content and materials

2.1 Introduction to Motion

Motion is defined as the change in position of a body relative to time and a reference point, identified by distinct types such as translatory, rotational, and vibratory motions.

2.2 Important Terms

This section defines key terms related to motion, including distance, displacement, speed, velocity, and acceleration, along with their respective units.

2.3 Distance vs. Displacement

This section explores the fundamental differences between distance and displacement, highlighting their properties and significance in motion.

2.4 Speed and Velocity

Speed refers to the rate of distance traveled, while velocity is the rate of change of displacement.

2.5 Acceleration

Acceleration is the rate of change of velocity with respect to time, crucial for understanding motion dynamics.

2.6 Graphical Representation of Motion

This section introduces how motion can be graphically represented, specifically through distance-time and velocity-time graphs.

2.7 Equations of Uniformly Accelerated Motion

This section introduces the equations that describe motion along a straight line with constant acceleration, focusing on relationships between displacement, velocity, acceleration, and time.

2.8 Free Fall and Acceleration due to Gravity

This section discusses the concepts of free fall and acceleration due to gravity, emphasizing how objects behave when acting solely under gravitational influence.

Learning Objectives

  • Motion is the change in position of an object over time.

  • Distance is a scalar quantity, while displacement is a vector quantity.

  • Acceleration can be positive (speeding up) or negative (deceleration), and it is calculated as the change in velocity over time.

Key Concepts

Distance

The total path length travelled by an object, expressed in metres.

Displacement

The shortest distance from the initial to the final position, which can be positive, negative, or zero.

Speed

The rate of change of distance, measured in metres per second (m/s) or kilometres per hour (km/h).

Velocity

The rate of change of displacement over time, also measured in m/s or km/h.

Acceleration

The rate of change of velocity, defined as the change in velocity divided by the time taken.

Free Fall

The motion of an object under the influence of gravity alone, with an acceleration due to gravity approximately equal to 9.8 m/s².

Practice Exercises

Total Questions

4

Estimated Time

8 min

Passing Score

70%

Instructions

  • Read each question carefully
  • You can use hints if you need help
  • Complete all questions before submitting