Friction is a force that opposes motion between any surfaces that are touching. Friction occurs because no surface is perfectly smooth.
Rougher surfaces
have more friction between them.
Which surface have more friction than which surface?
Friction is always more on
a rough surface
compared to a smooth surface. This is because rough surface offers more resistance to the movement of an object over it compared to a smooth surface.
What surfaces have less friction?
A
smooth surface
has smaller hills and valleys. There are also electrostatic attractions between surfaces, but these are weaker than the physical barriers to sliding. Liquids such as water and oil reduce friction because they keep the two surfaces from contacting each other.
What are the disadvantages of friction?
- Friction produces a lot of heat in various parts of the machinery and this leads to wastage of energy as heat.
- Opposes motion, hence more energy is needed to overcome friction.
- Noise production in machines is irritating as well as leads to energy loss.
Is rolling friction more than sliding friction?
As the area of contact is less in the case of rolling than in the case of sliding, rolling
friction is less than the sliding friction
. Rolling friction is the resistance to motion experienced by a body when it rolls upon another. It is much less than sliding friction for the same pair of bodies.
What three ways can reduce friction?
- Polishing the rough surface.
- Oiling or lubricating with graphite or grease the moving parts of a machine.
- Providing all bearings or wheels between the moving parts of a machine or vehicles reduce friction and allow smooth movement as rolling friction is less than sliding friction.
Why soapy floor is slippery?
Soapy floor is slippery
due to increased friction
. …
Is it true that if there is no friction you Cannot light a match?
Answer:
The burning of a matchstick would not be possible without friction
.It is difficult to light a matchstick by striking it on the smooth surface because enough friction is not provided by a smooth surface to produce sufficient heat. … To burn a matchstick, friction is necessary .
What are the 10 Disadvantages of friction?
- Friction Slow Down motion.
- it reduces the efficiency of machine .
- it produces heat which may damage machines.
- it wears out steps of staircase in buildings and foot over bridges.
- it wares out the brake pad of vehicle gradually.
- it wears is out the rubbing machine parts.
What is the three disadvantages of friction?
- Friction produces heat which damages the moving parts of a machine.
- Friction produces wear and tear on the contacting surfaces. This reduces the life of machine parts, tyres and shoe soles.
- A lot of energy is wasted in overcoming the friction before an object starts moving.
What gives friction a bad reputation?
Since friction is a resistive force that slows down or prevents motion, it can be a nuisance, because
it can hinder motion and cause the need for expending extra energy
.
Why is rolling friction the weakest?
Rolling friction is weaker
because basically, it is rolling
. The rolling motion or cyclical motion allows it to move, change direction, or change speed more easily. Rolling something is better at overcoming the resistance force. Less effort is needed to move an object that has wheels than a flat object.
What is easier rolling or sliding?
When an object rolls over the surface of another object ,the resistance to its motion is called
rolling friction
. It is always easier to roll than to slide an object over another object.So rolling friction is much less than the sliding friction.
Why friction can never be entirely eliminated?
Friction can never be entirely eliminated, because
no surface is perfectly smooth
, there are always some irregularities present in it.
What are 4 ways to reduce friction?
- Make the surfaces smoother. Rough surfaces produce more friction and smooth surfaces reduce friction.
- Lubrication is another way to make a surface smoother. …
- Make the object more streamlined. …
- Reduce the forces acting on the surfaces. …
- Reduce the contact between the surfaces.
Can water reduce friction?
For water to reduce friction,
it must reduce the contact area between two surfaces by separating them and acting as a barrier
. It can only do this if neither surface is absorptive, otherwise the water won’t remain between them.
