Yes, Friction will never speed up an object because friction slows objects down.
No.
False
braking
Yes. For example, if you place an object on a moving conveyor belt, the friction between the object and the conveyor belt will speed it up.
GravityGravity can do all three to an object, the best example of this would be tossing a ball straight up in the air: 1) It initially slows down to a halt at the highest point of ascent, 2) Then speeds up as it falls 3) And of course it changes directions at the top. FrictionFriction, however, is a different matter. Friction that deals with motion (dynamic friction) always acts in the opposite direction of motion; therefore, it cannot accelerate an object in the same direction as it is moving. Due to this, friction can only slow down an object. Can it reverse the direction of motion? Since it cannot speed up an object, it cannot make an object move after friction has slowed it down to a standstill like gravity can from the example above. Thus, in conclusion: gravity can slow down, speed up an object and change its direction; however, friction can only slow down an object.
The measure of friction is the amount of energy lost by heating through contact. This energy is generally lost through abrading the surfaces, or at least re-arranging the surface molecules. Thus it will absorb kinetic energy, and the object will slow down.
You may be thinking of drag instead of friction. Friction between the floor and your foot increases your speed.
Friction does not speed up an object; it creates drag and slows it down.
False
braking
Yes. For example, if you place an object on a moving conveyor belt, the friction between the object and the conveyor belt will speed it up.
If it did, then any rolling object would speed up because of friction. Since everythingthat rolls actually slows down, the virtual 'force' of friction must be exactly oppositethe direction of an object's motion.
GravityGravity can do all three to an object, the best example of this would be tossing a ball straight up in the air: 1) It initially slows down to a halt at the highest point of ascent, 2) Then speeds up as it falls 3) And of course it changes directions at the top. FrictionFriction, however, is a different matter. Friction that deals with motion (dynamic friction) always acts in the opposite direction of motion; therefore, it cannot accelerate an object in the same direction as it is moving. Due to this, friction can only slow down an object. Can it reverse the direction of motion? Since it cannot speed up an object, it cannot make an object move after friction has slowed it down to a standstill like gravity can from the example above. Thus, in conclusion: gravity can slow down, speed up an object and change its direction; however, friction can only slow down an object.
The measure of friction is the amount of energy lost by heating through contact. This energy is generally lost through abrading the surfaces, or at least re-arranging the surface molecules. Thus it will absorb kinetic energy, and the object will slow down.
Friction always works against the velocity and so it always works to slow down an object.
If the friction is less, then the position will stay the same and NOTHING would act upon the Object.
true. Friction DOES slow things down. In fact, if there was no friction once something started moving it wouldn't be able to stop Friction can slow the things down. It's true.
Speed it up!