work is movement, and all movement causes friction, since there is no such thing as a "perfect" or "100% efficient" tool yet.
there could be friction inside the motor. there is friction on the wheels of the scooter and the ground. there is air friction when you move on a scooter.
answer it yourself ;)
Friction's direction is always against the direction work is being applied to.
Gravity and friction there are others also like magnetism for example..
FRICTION
friction
Some common questions about friction that are frequently asked include: What is friction and how does it work? What factors affect the amount of friction between two surfaces? How can friction be reduced or increased? What are the different types of friction?
We would need to know what the friction is to affect to respond to this question.
ice can affect friction
When work is done on a sliding block with friction, it can either increase or decrease the block's potential energy, depending on the direction of the force applied. If the work is done against the force of friction, the potential energy of the block increases. Conversely, if the work is done in the direction of the force of friction, the potential energy of the block decreases.
Speed does not affect the force of friction.
Work Input = Work Output + Work done in overcoming friction.Therefore Work Input > Work Output.
Friction is the force that opposes the motion of an object when it is in contact with another surface. It affects the work done by causing energy to be lost as heat, which reduces the efficiency of a system. More friction means more energy is needed to overcome it, resulting in more work being done.
Friction between the parts of a machine decreases the work output by converting some of the input energy into heat. This results in inefficiencies and reduces the overall performance of the machine. To compensate for the energy loss due to friction, more work input is required to achieve the desired work output.
Well, if, for example, you had interlocking gears, the friction would slow down the speed of how they turn. Friction also causes heat, so too much friction could make a computer or a more advanced machine, melt inside. I think that DEFINETELY affects the work of a machine.
The forces that work on a system can include gravity, friction, tension, and normal force. These forces can affect the motion and equilibrium of the system.
surface friction and sliding friction