PHYSICS MIDDLE SCHOOL

Name two ways to reduce friction and two ways to increase it.

Answers

Answer 1
Answer: Ways to increase friction 

- increase the roughness of the contact materials 
- increase the pressure on the contact 


Ways to decrease friction 

- float the moving body on air 
- suck out any air 

Related Questions

What substance does rock behave like when it is exposed to extreme temperature and pressure?
Can someone please help me with this question.
Which organ system includes the esophagus, pancreas, and large intestine?A) Digestive B) ExcretoryC) IntegumentaryD) Lymphatic
All of the outer planets have what? (Moons and rings system, just rings systems, just moons, or humans)
a graph is named mpg vs speed of a car traveling on a straight flat road. what does that name tell us about the graph

What's exactly the 4 dimension (4D)?

Answers

Time is bounded up in the concept of Space. One without the other cannot be. Time is, in the Theory of Strings, the 4th dimension.

While participating in a blood drive at school, Keona learns that blood has a density of 1.06 g/mL. She donates one pint of blood, which is equal to 473.176 mL. What is the mass of the blood Keona donates

Answers

501.56656 g or 501.57 g.

Answer:  501.57 g

Explanation:

Please help....View the image and answer the question.

Identify the concept that the angle above represents and explain what it means in your own words.

Answers

Answer:

its a compass rose or a temperature that tells how is it hot or cold or it is to u where to go when needed like a map.And the angles is 6

Explanation:

In order for a color to be seen by a human, the light must be what?

Answers


The light must be within a certain, rather narrow, range
of wavelength/frequency, and it must enter his eye.

What happens to the negative charges

Answers

Answer:

The correct option is C) spreads out over a large area on the object.

Explanation:

In physics, a ground can be described as a reservoir object in which charge can be stored. Grounding refers to the removal of charge in an object by using the ground object. When an object with excess if charge is placed on the ground object, the electrons are transferred from the charges object to the ground object. This charge begins to spread evenly in the ground object with the passage of time.

A merry -go-round rotates at the rate of 0.4rev / s with an 78 kg man standing at a point 1.5 m from the axis of rotation. What is the new angular speed when the man walks to a point m from the center? Consider the merry-go-round is a solid 11 kg cylinder of radius of 1,5 m. Answer in units of rad/s. 024 (part 2 of 2) 10.0 points What is the change in kinetic energy due to this movement ? Answer in units of

Answers

1) Final angular velocity is 5.22 rad/s

2) Change in kinetic energy: 639.8 J

Explanation:

1)

In absence of external forces, the angular momentum of the merry-go-round must be conserved.

So we can write:

L_1 = L_2\nI_1\omega_1 = I_2 \omega_2

where

I_1 is the initial moment of inertia

I_2 is the final moment of inertia

\omega_1 is the initial angular velocity

\omega_2 is the final angular velocity

At the beginning, we have:

\omega_1=0.4 rev/s \cdot 2\pi = 2.51 rad/s

The moment of inertia is the sum of the moment of inertia of the cylinder + the moment of inertia of the man, therefore:

I_1 = (1)/(2)MR^2+mr^2=(1)/(2)(11)(1.5)^2+(78)(1.5)^2=187.9 kgm^2

The man later walks to a point 1 m from the centre, so the final moment of inertia is:

I_2 = (1)/(2)MR^2+mr^2=(1)/(2)(11)(1.5)^2+(78)(1)^2=90.4 kgm^2

Therefore, the final angular velocity is

\omega_2 = (I_1 \omega_1)/(I_2)=((187.9)(2.51))/(90.4)=5.22 rad/s

2)

The angular velocity of the merry-go-round rotating is given by

K=(1)/(2)I\omega^2

In the  first situation, we have

I_1 = 187.9 kg m^2\n\omega=2.51 rad/s

Therefore

K_1 = (1)/(2)(187.9)(2.51)^2=591.8 J

In the second situation, we have

I_2= 90.4 kg m^2\n\omega_2=5.22 rad/s

Therefore

K_2=(1)/(2)(90.4)(5.22)^2=1231.6 J

So the change in kinetic energy is

\Delta K = K_2 - K_1 = 1231.6-591.8=639.8 J

Learn more about circular motion:

brainly.com/question/2562955

brainly.com/question/6372960

#LearnwithBrainly
Other Questions
How many degrees in fahrenheit is 6.75 degrees celsius?
PLEASE HELPPPP THANK YOUUUU!!! 1. Which way does light bend when traveling from air to glass? -Toward the normal-Away from normal-Doesn’t bend2. Which way does light bend when traveling from glass to air? -Toward the normal-Away from normal-Doesn’t bend3.Of your three mystery materials, in which will light travel the fastest? Why?
Gravity affects all mass, how?
How much force is needed to get a 0.9kg block of wood to slide if the static coefficient of friction is 0.8