Unit 1MotionIn the previous section

Unit 1
Motion
In the previous section, you have come across many examples of motion. You have learnt that to describe the motion of an object we must know its position at different points of time. The position of an object is always taken with respect to some reference point. The straight line motion of a particle is the easiest to describe and we begin this section with it. Straight line motion can be purely vertical (as that of a falling ball), purely horizontal (as that of a cyclist on a straight road) or slanted (as that of a wheelchair on a ramp). Before reading further, you may like to jot down a few examples of straight line motion around you. Use the margin!
There are many ways of describing motion: Through words, pictures, graphs and mathematical equations. In this section, we shall be using the first three ways for describing the position, distance, displacement, speed, velocity and acceleration of objects moving along a straight line.
1.3.1 Position, Distance and Displacement
Study Fig. 1.4. It shows a ball rolling straight on a surface in the direction of the brown arrow. What is its position? We can use the following definition to answer this question:
The POSITION of an object moving along a straight line is uniquely defined by its coordinate with respect to some point of reference. This point is often taken to be the origin (the point O in Fig. 1.4). The position in straight line motion is fully specified by 1 coordinate. This is why it is also called ONE-DIMENSIONAL motion.
O
−3−2−1 123
x < 0 x = 0 x > 0
Fig. 1.4: The position of an object in straight line motion is defined by 1 coordinate. The positive direction (x > 0) of the axis is the direction of increasing numbers (coordinates). It is to the right in Fig. 1.4. The opposite direction is the negative direction.
For a given problem, the origin can be chosen at any convenient point. Usually, the position of the object at time t = 0 is chosen as the origin. Let us now define the words distance and displacement.

ผลลัพธ์ (อังกฤษ) 1:

unit 1
motion
in the previous section, you have come across many examples of motion. you have learnt that to describe the motion of an object we must know its position at different points of time. the position of an object is always taken with respect to some reference point. the straight line motion of a particle is the easiest to describe and we begin this section with it.straight line motion can be purely vertical (as that of a falling ball), purely horizontal (as that of a cyclist on a straight road) or slanted (as that of a wheelchair on a ramp). before reading further, you may like to jot down a few examples of straight line motion around you. use the margin!
there are many ways of describing motion: through words, pictures, graphs and mathematical equations.in this section, we shall be using the first three ways for describing the position, distance, displacement, speed, velocity and acceleration of objects moving along a straight line.
1.3.1 position, distance and displacement
study fig. 01.04. it shows a ball rolling straight on a surface in the direction of the brown arrow. what is its position?we can use the following definition to answer this question:
the position of an object moving along a straight line is uniquely defined by its coordinate with respect to some point of reference. this point is often taken to be the origin (the point o in fig. 1.4). the position in straight line motion is fully specified by 1 coordinate. this is why it is also called one-dimensional motion.
o
.-3-2-1 123
x <0 x = 0 x> 0
fig. 1.4: the position of an object in straight line motion is defined by 1 coordinate. the positive direction (x> 0) of the axis is the direction of increasing numbers (coordinates). it is to the right in fig. 01.04. the opposite direction is the negative direction.
for a given problem, the origin can be chosen at any convenient point. usually,.the position of the object at time t = 0 is chosen as the origin. let us now define the words distance and displacement.
.

ผลลัพธ์ (อังกฤษ) 3:

1

Unit Motion In the previous section, you have come across many examples of motion. You learnt that have to describe the motion of an object we must know its position at different points of time. The position of an object is always taken with respect to some reference point. The straight line motion of a particle is the easiest to describe and we begin this section with it.Motion Straight line can be purely vertical (as that of a falling ball), purely horizontal (as that of a cyclist on a straight road) or slanted (as that of a wheelchair on a ramp). Before reading further, you may like to jot down a few examples of straight line motion around you. The margin Use!
There are many ways of describing motion: Through words, pictures, graphs and mathematical equations.In this section, we shall be using the first three ways for describing the position, distance, displacement, speed, velocity and acceleration of objects moving along a straight line. 1.3
1 Position, and Distance Displacement
Study Fig. 1.4. It shows a straight ball rolling on a surface in the direction of the arrow brown. What is its position?We can use the following definition to answer this question:
The POSITION of an object moving along a straight line is uniquely defined by its coordinate with respect to some point of reference. This point is often taken to be the origin (the point in O Fig. 1.4. The position in straight line motion is fully specified by coordinate 1. This is why it is also called ONE - DIMENSIONAL motion.

O3 − − − 2 1123
x< 0X = 0 X > 0
Fig. 1.4: The position of an object in motion is defined by straight line coordinate 1. The positive direction (X>0) of the axis is the direction of increasing numbers (coordinates) is to the right in It Fig. 1.4. The opposite direction is the negative direction.
For given a problem, the origin can be chosen at any convenient point. Usually,The position of the object at time T = 0 is chosen as the origin. Let us now define the words distance and displacement.