Almost.
speed is (the rate of) the change in position.
Short answer: yes. An object in "motion" has a "speed" simply by virtue of its being in motion. An object possessing a speed is inherently in motion. In this sense they have similar meanings. Speed is a rate of change in position. Motion is a change in position (in progress). In this sense, speed is more specific than motion in that speed has a quantitative value. Conversely, there can be no "speed" without "motion". To be complete, "velocity" is even more specific than speed in that it contains a rate of change in position together with a direction. That is, speed is a "scalar" quantity, and "velocity" is a vector quantity.
When it changes position or something to do with the speed.
no motion is the movement itself, the change in position of an object with respect to time. rate of change of speed is acceleration. change in speed is just change in speed.
Motion at constant speed.
Well, we know that velocity describes the speed and direction of motion, so you can't change either of those. We don't usually think of 'position' as a characteristic of motion, but if we try hard to please you, then we might observe that the position changes while velocity remains constant.
Short answer: yes. An object in "motion" has a "speed" simply by virtue of its being in motion. An object possessing a speed is inherently in motion. In this sense they have similar meanings. Speed is a rate of change in position. Motion is a change in position (in progress). In this sense, speed is more specific than motion in that speed has a quantitative value. Conversely, there can be no "speed" without "motion". To be complete, "velocity" is even more specific than speed in that it contains a rate of change in position together with a direction. That is, speed is a "scalar" quantity, and "velocity" is a vector quantity.
A change in position in a certain amount of time is called motion.
Motion is change of position. but remember both must always be related to some 'datum' position or state of motion.
When it changes position or something to do with the speed.
When it changes position or something to do with the speed.
The motion at constant speed.
no motion is the movement itself, the change in position of an object with respect to time. rate of change of speed is acceleration. change in speed is just change in speed.
The motion at constant speed.
Zero.
Velocity
Motion at constant speed.
Well, we know that velocity describes the speed and direction of motion, so you can't change either of those. We don't usually think of 'position' as a characteristic of motion, but if we try hard to please you, then we might observe that the position changes while velocity remains constant.