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3 years ago

What is kinetic friction ? what causes it ? what does it generate ?

Physics

1 answer:

diamong [38]3 years ago

3 0

Answer:

What is kinetic friction?

Kinetic friction is defined as a force that acts between moving surfaces. A body moving on the surface experiences a force in the opposite direction of its movement.

What causes it?

When the mass is not moving, the object experiences static friction. The friction increases as the applied force increases until the block moves. After the block moves, it experiences kinetic friction, which is less than the maximum static friction.

What does it generate?

When surfaces in contact move relative to each other, the friction between the two surfaces converts kinetic energy into thermal energy (that is, it converts work to heat). This property can have dramatic consequences, as illustrated by the use of friction created by rubbing pieces of wood together to start a fire.

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Which of the following is a purpose of rules in sports and games? (5 points)

ValentinkaMS [17]

Answer:

To keep everyone safe

Explanation:

Without rules people could get hurt

4 0

3 years ago

describe how light reflecting from a mirror can produce an image. In particular, explain how mirrors can produce images that are

VikaD [51]

Answer:

A larger image is produced when $d_i$ > $d_o$

A smaller image is produced when $d_i$ < $d_o$

An upright image is produced when m is positive

An upright image is produced when m is negative

Explanation:

The mirror equation is given as follows;

$\dfrac{1}{f} = \dfrac{1}{d_i} + \dfrac{1}{d_o}$

$m =-\dfrac{d_i}{d_o} = \dfrac{h_i}{h_o}$

For concave mirrors, f = focal length

$d_i$ = Image distance from the mirror (-ve $d_i$ = Image is behind the mirror +ve $d_i$ = Image is in front of the mirror)

$d_o$ = Object distance from the mirror (-ve $d_o$ = Object is behind the mirror +ve $d_o$ = Object is in front of the mirror)

m = Magnification (-ve m = Inverted image +ve m = upright image)

$h_i$ = Image height

$h_o$ = Object height

f = Focal length of the mirror

To produce a larger image $d_i$ > $d_o$

To produce a smaller image $d_i$ < $d_o$

To produce an upright image, m should be positive hence, $d_i$ will be negative or the image will appear behind the mirror

To produce an inverted image, m should be negative hence, $d_i$ will be positive or the image will form in front of the mirror.

5 0

3 years ago

What is the ratio of a 0.7 in circle in centimeters.

kifflom [539]

I believe it would be 4.4

4 0

3 years ago

The diagram shows the flow of water through a hydroelectric power station. The falling water

KonstantinChe [14]

Answer:

KE = $\frac{1}{2}$ m $v^{2}$

Explanation:

In the generation of energy from hydroelectric power station, the motion of water, and the turbines are paramount. The falling flowing water turns the blades of the turbine, which in-turn causes the movement of a coil within a strong magnetic field.

The motion of the coil which cuts the strong magnetic field induces current. Thus, the system generates electrical energy.

The equation that links kinetic energy (KE), mass (m) and speed (v) can be expressed as:

KE = $\frac{1}{2}$ m $v^{2}$

7 0

3 years ago

You stand on a spring scale on the floor of an elevator. Of the following, the scale shows the highest reading when the elevator

Virty [35]

Answer:

move upward with increasing speed

I draw fbd diagram , see in figure

when lift going upward -

F - mg = ma

f = m( a + g)

scale so highest reading

5 0

4 years ago