See the discussion box for the options. The answer is A, D and E.
Speed is how fast something is moving. When to things are traveling at the same speed and rubbing together, they can cause friction.
Friction and Gravity are the two forces that affects an object's velocity. Friction is caused by both air and the surface on which an object is moving. Gravity is caused by Earth.
Same way it affects all structures - heat and sound is produced, and some material is lost due to ablation (being rubbed away).
A contact force, such as friction. If a car wheel wasn't on the ground there couldn't be friction. A non-contact force could be magnets, the two magnets don't need to touch to repel or attract :)
Grip is a combination of pressure and friction. The more pressure one exerts upon an object the greater the friction and then the better grip one would have on the object in hand. Same goes for anything that can grip like tires, shoes, etc. Another thing that affects grip is the pattern of the surface applying the pressure, different patterns will exert the force differently.
Yes. Weight, being a force perpendicular to the surface, affects the magnitude of the friction, but not the friction coefficient.
By using kinetic friction
friction affects in any Circumtances
no, friction just changes the motion of an object.
Yes, linearly. The more it weighs, the more friction.
if there is friction on the hill it will slow you down
Friction, gravity, wind resistence(form of friction)
it affects motion by friction a friction pull it down or up
No. The velocity ratio remains constant but the friction absorbs power.
Friction acts in the direction opposite to that of the net force acting on the object.
Yes, friction affects stopping distance. The greater the friction the lower the stopping distance; the lower the friction the greater the stopping distance.
Friction affects most every thing. In a mechanical metronome you would not need a power source if there were no friction.