Gravity! Or being or staying right in front of or behind that thing or moving object.
Objects moving at constant speed in a straight line are said to be in equilibrium. That is there is no force acting on them. If a force was acting there would be aceleration and the velocity would change.
straight line
It is due to its inertia of motion
Moving directly straight either horizontally or vertically. As if walking on a straight line.
I guess because they are both a straight line and they each move back and forward
It is called inertia.
inertia
Objects moving at constant speed in a straight line are said to be in equilibrium. That is there is no force acting on them. If a force was acting there would be aceleration and the velocity would change.
light travels in a straight line because it can only be bend by reflective objects.
straight line
Moving directly straight either horizontally or vertically. As if walking on a straight line.
Inertia is the tendency of objects to keep moving in a straight line. They "want" to go in a straight line, so to speak. However that is changed when a force acts on them. In the case of planets, that force is the gravitational force between the planet and the Sun.So that's why planets orbit the Sun instead of traveling in a straight line.
It is due to its inertia of motion
Moving directly straight either horizontally or vertically. As if walking on a straight line.
Light travels in a straight line. The path of light can be bent by very massive objects because they actually bend space.
Friction opposes the motion of one object moving past another. Objects at rest remain at rest and objects traveling at a steady rate in a straight line continue that way until a force acts on them.
I guess because they are both a straight line and they each move back and forward