There are a number of ways to reduce friction:
Make the surfaces smoother. Rough surfaces produce more friction and smooth surfaces reduce friction. Some swimmers wear suits to reduce underwater resistance. These suits mimic the smooth skin of sharks.
Lubrication is another way to make a surface smoother. A lubricant is a slippery substance designed to reduce the friction between surfaces. You might use oil to stop a door from squeaking - the oil reduces the friction in the hinge. Water can be used as a lubricant - think of how a floor becomes slippery after it has been mopped.
Make the object more streamlined. A streamline shape is one that allows air or water to flow around it easily, offering the least resistance. Compare a boxy old car with a new car that has a rounded shape, allowing it to move with less effort.
Reduce the forces acting on the surfaces. The stronger the forces acting on the surfaces, the higher the friction, so reducing the forces would reduce the friction. If you apply the handbrake when you try to drive a car, the car will have a lot of difficulty moving because of the force immobilising (stopping the movement of) the wheels. If you release the handbrake, the wheels will move more freely because there is no extra force acting on them.
Reduce the contact between the surfaces. Have you ever tried to roll a cube? Spheres are the best shape for reducing friction because very little of a spherical object is in contact with the other surface. Several types of wheels, such as skateboard wheels, contain small spheres called ball bearings to reduce the friction between the moving parts. You can witness the effect of ball bearings by comparing the friction between sliding a book on a table and then doing the same, but using marbles between the book and the surface of the table. Notice how the marbles act as ball bearings, reducing the friction.
Answer:
In the 150 years since Darwin proposed the theory of evolution by natural selection, a mountain of evidence has accumulated ... How can you know what happened millions of years ago if no one was there to see it? Evidence and observation are the building blocks of all scientific inquiry; evolutionary science is no different
Explanation:
Bond formation is the way in which atoms interact to form compounds.
<h3>What is bond formation?</h3>
Bond formation is the way in which atoms interact to form compounds. The following are the kind of bonds formed by the atoms;
C and AI - ionic bond
N and P - covalent bond
N and O - covalent bond
The bonds in each of the lattices are;
CuO - ionic bond
Hg - metallic bond
P2O5 - covalent bond
P - covalent bond
CaCl2 - ionic bond
The following is a depiction of the processes shown;
Na0 →Na+1 - oxidation
P0→P+5 - oxidation
AI+3 → AI0 - reduction
The balanced reaction equations are;
2H2O + F2 → 2HF + O2
SO2 + 3H2 → H2S + 2H2O
2H2SO4 + C → 2SO2+CO2+2H2O
Learn more about balancing reaction equation:brainly.com/question/22064431
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Answer:
pressure
Explanation:
you have to use energy to apply pressure, so i mean....
