Table of Contents
When do you say that an object is moving?
An object is moving if its position relative to a fixed point is changing. 4.1 Motion Is Relative 4 Linear Motion Even things that appear to be at rest move. When we describe the motion of one object with respect to another, we say that the object is moving
How can you change the motion of an object?
We can change the state of motion of an object by changing its speed, its direction of motion, or both. Acceleration is the rate at which the velocity is changing. In physics, the term acceleration applies to decreases as well as increases in speed.
How is displacement represented in one dimensional motion?
With one-dimensional motion, we can define a straight line along which the object moves. Let’s call this the x-axis, and represent different locations on the x-axis using variables such as and , as in Figure 2.1. If an object moves from one position to another we say it experiences a displacement.
According to the textbook definition, the instantaneous speed is the change in object position, x, between two times, t₁ and t₂ (where this time interval approaches zero, i.e., t₂ – t₁ -> 0). The rotational speed is a slightly different term, related rather to rotating objects than to objects that change their position in space.
Which is the average speed of an object?
The average speed of any object moving in a straight line with constant acceleration is the average of the initial speed and the final speed. The average speed of a freely falling object in its first second of fall is the sum of the initial speed of zero and the final speed of 10 m/s, divided by 2, or 5 m/s.
How are speed and velocity related in physics?
Speed is a description of how fast an object moves; velocity is how fast and in what direction it moves. In physics, velocity is speed in a given direction. When we say a car travels at 60 km/h, we are specifying its speed. When we say a car moves at 60 km/h to the north, we are specifying its velocity.
How to describe the motion of an object?
Before you will be able to describe the motion of an object, you must first be able to tell exactly where it is positioned. Describing exact position entails two ideas: describing how far the object is from the point of referenceand describing its direction relative to that point of reference.