friction can cause:
1) Physical wear and tear of moving parts.
2) degradation of materials by continuous friction.
3) wastage of 70% of energy in car engines.
However, friction is useful in:
1) walking
2) car brakes, friction between brake pads and Tyre causes car to slow down.
3) techniques like friction welding.
No, the work done by friction can be either positive or negative, depending on the direction of the force and the displacement of the object.
Friction opposes motion. As long as you define the direction in which the object is moving to be positive, the acceleration due to friction will be negative. If you think about it, you start out with positive speed and friction decreases the speed, so adding friction subtracted from the speed. Note: Friction is counterintuitive when you start dealing with rolling without slipping. This answer doesn't address this.
Negative effects of mechanical energy include the potential for injuries if not properly controlled or harnessed. Positive effects include the ability to perform work efficiently and power various machines that improve daily life and productivity.
It depends on how the axes are defined. If the for motion in one dimension, if the positive direction is defined direction of motion, then yes, because friction opposes motion. If the motion is in two or three directions, then the force of friction is a vector and, strictly speaking, neither positive not negative. The sign (if any) of any force is arbitrary, as long as all forces in the diagram use the same frame of reference.
Being counter-friction means to act in opposition or resistance to friction. It involves implementing measures or strategies to counteract the negative effects of friction, such as reducing resistance or increasing efficiency.
Friction can be negative or positive depending on the direction in which your measures are positive.
The effects of forces are materials can be either positive or negative. Positive effects include the ability to stop due to friction.
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