Nope - friction slows machines down.
The motion of the needle in a sewing machine is vertically, rapidly up and down.
No, cooling actually slows down the motion of particles. When a substance is cooled, the particles lose kinetic energy, which leads to a decrease in their speed of motion.
A force that is perpendicular to the direction of motion of the object will never speed it up. This is because the force is unable to transfer any of its energy in the direction of motion.
Work
verticle
It can change the direction of motion or it can speed up or slow down an object.
A rectilinear motion is a motion along a straight line. It can be one, two, or three dimensional. Non-accelerated motion is when a body is in motion, but there isn't a force to speed it up or slow it down. Therefore, non-accelerated rectilinear motion would be a motion along a straight line that has no force trying to speed it up or slow it down.
The speed of the object and its direction of motion.
Friction acts to slow down the motion of an object. It opposes the relative motion between two contacting surfaces, reducing the speed of the object in motion.
That is what I need :)
It moves the needle up and down at a constant speed.
That could be one description of "force" or "net force."Notice that it can also change the direction in which an object is moving,without changing its speed at all.