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In this chapter, we study speed, velocity, and acceleration for motion in one-dimension. One dimensional motion is motion along a straight line, like the motion of a glider on an airtrack.
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The study of motion is kinematics, but kinematics only describes the way objects move—their velocity and their acceleration. Dynamics considers the forces that affect the motion of moving objects and systems. Newton’s laws of motion are the foundation of dynamics.
- What Is Motion?
- Types of Motion
- Examples of Motion
We can define motion as the change of position of an object with respect to time. A book falling off a table, water flowing from the tap, rattling windows, etc., all exhibit motion. Even the air that we breathe exhibits motion! Everything in the universe moves. We live in a universe that is in continual motion. The fundamental particle of matter, t...
We might have noticed that different objects move differently. Some objects move in a curved path, some in a straight path and a few others in a different way. According to the nature of the movement, motion is classified into three types as follows: 1. Linear Motion 2. Rotary Motion 3. Oscillatory Motion
Now let us understand motion clearly with the help of a few examples. 1. Our daily activities, like walking, running, closing the door, etc. involve motion. There is a change of position of the object involved in these activities. 2. The flow of air in and out of our lungs is also an example of motion. 3. The automobiles that carry passengers from ...
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Before Newton, everyone thought (incorrectly!): "Force causes motion." WRONG! (You can have motion without any force causing the motion. Example: glider on an air track.) After Newton, "Force causes changes in motion." RIGHT! Definition: The WEIGHT of an object = the force of gravity on the object. W = mg Why?
When object starts from rest and undergoes constant acceleration: Position is proportional to the square of time. Position changes result in the sequence of odd numbers. Falling bodies exhibit this type of motion (since g is constant).
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For instance, some of the basic rules about forces are summarized by Newton’s laws of motion, so we will devote some time to understanding what these laws are all about and how they are applied in various situations.
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How do we define motion?
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before we introduce Newton’s Laws. A force is an interaction between two bodies or between a body and its environment. One intuitive type of force is a contact force, which often clearly involves a direct interaction (or contact) between the surfaces or boundaries of the bodies involved.
