Question #3c4b2

Straight line motion or rectilinear motion is a term used to describe objects that are moving in a straight line. Whereby the length of the path taken is the length of a straight line.

This different from straight motion with circular motion, whereby the path taken by the object, in its motion, is a circle. And the length of the path taken would be the length of an arc.

A Reference point is a fixed point ( usually a defined place in space) from which we can conveniently measure some quantities such as distance, frequency of sound etc.

An example is when your traveling from your house to your Grandma's house. At any point in time(except in the middle of the path) your distance from your house is not the same as the distance from your Grandma's house .

What i want to say is that if you take your house as the reference point, then the distance will be different from when you take Grandma's house a reference point( that should make sense.)

The *origin* is just like the reference point. The only specificity is that it usually refers to distance moved and not other quantities.
Consider, the cartesian(#x-y#) plane; the point (#0,0#) is the origin.

A *frame of reference is the name given to a place or environment from which an observation is made, And this environment causes a difference in the way we view* what is happening.

For example:
Say we were traveling in a car, in London! and we're viewing the Great wheel while passing by. And say another observer is sited on a bench and gazing the Wheel as well.

From our point of view it will appear that the wheel is moving backward(kept aside the fact that we are aware that we're moving, in the car).
Whereas, from the observer whose is sited on the bench(stationary), the Wheel is perfectly as rest, on the ground, not traveling in some direction.
So here we say that we have two frames of reference in this situation.
The first frame, is the car and the second is the bench.