A block slides to the right on a rough horizontal surface. The forces exerted on the block are shown above. Which of the following statements about the frictional force Ff exerted on the block is true?
A) It is the only force acting on the block that is caused by microscopic interactions.
B) It does not depend on the materials that the block and the surface are made of.
C) It is caused by gravitational interactions between the atoms in the block and the atoms in the surface.
D) It is the sum of all the microscopic contact forces between the bottom of the block and the surface.
Answers
Answer:
The correct option is;
A) It is the only force acting on the block that is causes by microscopic interactions
Explanation:
The force of friction is the force due to the relative motion of two surfaces in the presence of a perpendicular force acting between the surfaces.
The force of friction comes into play from the additional effect of the adhesion that is present between surfaces, the roughness of the surfaces, the contamination or deformation of the surfaces which is generated by the microscopic interactions be between the two surfaces, rather than the applied force.
The characteristics of the friction force, you can find which statements are correct:
D) It is the sum of all the microscopic contact forces between the bottom of the block and the surface.
The force is an image of the interactions between bodies, these interactions create binding energy that can be formed and broken, the friction force is the macroscopic sum of all these microscopic interactions between two different surfaces.
The magnitude of the friction force depends on the type of each surface, on rough surfaces the interaction area is high, therefore the friction force is high, on smooth surfaces the interaction area is small, therefore the force is small, a way to create superficiality is to place a layer of air between the two surfaces.
Based on these explanations, let's review the different statements:
A) False. The friction forces are caused by interaction, but between two bodies not within the same body, this is what maintains the shape and volume of the body.
B) False. The contact area depends on each surface and therefore each type of material
C) False. The gravitational force is this in the line of interaction between the two bodies, in this case the force is perpendicular to movement, not in the line of interaction.
D) True. It is the sum of the interactions in the contact between the two bodies, it agrees with the explanation above.
Using the characteristics of the friction force, we can find the statements that are correct is:
D) It is the sum of all the microscopic contact forces between the bottom of the block and the surface.
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Related Questions
According to the FDA, food producers should label their products with the scientific name of the ingredients only.
Answers
Answer:
???
Explanation:
What specifically are you asking about
Answer:
no
Explanation:
because , not all the time the buyers can understand the scientific meaning
The diagram shows a hand reaching for a doorknob.
Which action would decrease the strength of the electric force between the hand and the doorknob?
A) moving the hand closer to the doorknob
B) moving the hand farther away from the doorknob
C) adding negative charges to the hand
D) magnetizing the doorknob
Answers
Answer: Moving the hand farther away from the door knob
Explanation:
The magnetic force becomes weaker when there is more distance
The magnetic force becomes weaker when there is more distance.
What is Electric force?The nucleus and electrons are drawn to one another by the electric force. The void created by a positive or negative charge is referred to as an electric field since it generates a field there.
If you had a positive charge just here, it would have an electric field surrounding it and affect the area in which it was located.
The same applies for a negative charge; it too has an electric field surrounding it. Now, opposite charges attract each other while like charges repel one another. A positive charge here and a positive charge here, for example, would resist one another since they are similar charges.
Therefore, The magnetic force becomes weaker when there is more distance.
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Atoms are known to form charges due to their ability to gain and lose electrons in reactions. As a result, atoms
become ions that are positively or negatively charged depending on the loss or gain of electrons. Which of the
following atoms has a charge of +2 given the number of electrons?
O A. O: 10 electrons
OB. N: 10 electrons
O C. Fe: 24 electrons
OD. Cl: 18 electrons
Answers
Answer:
C. Fe: 24 electrons
Explanation:
From the analogy given, the atom with a charge of +2 is Fe having 24 electrons.
To calculate the charges on an atom;
Number of charges = Number of protons - Number of electrons.
O: 10 electrons: 8 protons = 8 - 10 = -2
N: 10 electrons; 7 protons = 7 - 10 = -3
Cl: 18 electrons; 17 protons = 17 - 18 = -1
So;
Fe: 24 electrons and 26 protons = 26 -24 = +2
Therefore, the solution is Fe
If you run the 100 m track at a velocity of 5.0 m/s, what is the time needed?
Answers
The motion of a car on a position-time graph is represented with a horizontal line. What does this indicate about the car’s motion? A. It’s not moving. B. It’s moving at a constant speed. C. It’s moving at a constant velocity. D. It’s speeding up. i dont know if ive asked this before if i have sorry
Answers
Which three statements could explain the increase in the deer population? A. Rainfall was above average over the past five years B. A hawk species settled into the area five years ago C. Extremely harsh winters occurred during the past five years D. The number of cattle ranchers decreased in the past five years E. The law allowed an extended wolf hunting season for the past five years
Answers
Answer:
D. The number of cattle ranchers decreased in the past five years
Explanation:
According to Jennifer M Schieltz and Daniel I Rubenstein (2016), "More than a quarter of earth's land surface is used for grazing domestic livestock." This has negative effects on availability of pasture for herbivorous wildlife such as the deer.
Increase in the number of cattle ranchers decreases the availability of pasture and vice versa.
Hence, the decrease in the number of cattle ranchers over the past five years led to an increase in the deer population due to a decrease in competition for pasture.
What is an astronomical unit?
the average distance between planets in the solar system
the average distance between the Earth and the moon
the approximate diameter of the Sun including its atmosphere
the average distance between the Earth and the Sun
Answers
Answer:
D
Explanation:
The ability of the heart, blood vessels and lungs to supply oxygen to the body is?
Answers
The ability to allow the heart, blood, vessels, and lungs to supply oxygen to the body is called Cardiovascular fitness.
what is an example of a non credible online source?
A a chat room for music lovers
B a website run by a university
C the white house's website
D a site for a volunteer organization.
help im being timed 01:37:17
Answers
I need help with these 2 questions asap please
Answers
Answer:
for number 10
I can't see what needs to be calculated for the first question though
HURRRY PLEASSSSEEE
Energy required for cellular respiration can be processed from ____.
A) Carbohydrates
B) Fats/ Lipids
C) Proteins
D) All of the above
Answers
Answer:
fats / liquids or proteins one of them
Explanation:
..........
Answer:
D) All of the above
Explanation:
I googled it :)
An Object moving at a velocity of 30 m/s slows to a stop in 7 seconds. What was its acceleration
Answers
Answer:
The answer is 4.29 m/s²Explanation:
The acceleration of an object given it's velocity and time taken acting on it can be found by using the formula
[tex]acceleration = \frac{velocity}{time} \\ [/tex]
From the question
velocity = 30 m/s
time = 7 s
We have
[tex]acceleration = \frac{30}{7} \\ = 4.285714...[/tex]
We have the final answer as
4.29 m/s²Hope this helps you
Why do storm go to Galveston?
Answers
Hurricanes and tropical storms can also spawn tornadoes and microbursts, create storm surges ... If you are unable to evacuate, go to your wind-safe room.
Which type of thermal energy transfer does a foil wrapping reduce the most? O A. Conduction O B. Translation O C. Radiation O D. Convection
Answers
The foil reduces radiation the most in terms of thermal energy transfer. Thermal energy transfer is the movement of heat from one place to another. The four types of thermal energy transfer are radiation, conduction, convection, and advection. The correct answer is option OC.
Foil wrapping reduces radiation as the most type of thermal energy transfer. Thermal energy transfer is the movement of energy from one place to another. There are four types of thermal energy transfer: conduction, convection, radiation, and advection. The foil wrapping reduces radiation the most. When there is a foil wrapped around food, the foil traps the heat inside the food, which reduces the radiation energy transfer. Radiation is the heat transfer that occurs in the form of electromagnetic waves. It requires no matter to move, which is why it can occur in the vacuum of space. Radiation transfer can be absorbed, transmitted, or reflected. Therefore, the correct answer is option OC.For more questions on radiation
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Which is not a fundamental force?
A) normal force
B) gravity
C) weak force
D) strong force
Answers
Answer:
A
Explanation:
the four fundamental forces are gravity, the weak force, electromagnetism, and the strong force.
As shown in the figure below, Jenna rushes 30 m toward her truck. She notices she forgot her jacket and
returns back to the house. Her total travel time is 75 s.
30 m
30 m
What is Jenna's average velocity over the 75 s period?
What is Jenna's average speed over the 75 s period?
Answers
Answer:
Average Velocity: 0
Average Speed 0.8
Explanation:
Velocity - (30-30)/75 = 0
Speed - (30+30)/75 = 0.8
why the formation of sand is a physical change.
Answers
I hope this helps!
3. How many elements are found naturally on the Farth? *
Answers
Answer:
Fir wat glasss
Explanation:
3. What is the mass of a paratrooper who experiences an air resistance of 400 N and an acceleration of 4.5 m/s2
during a parachute jump.
Answers
Answer:
88.89kg
Explanation:
The formula for mass is m=F/a. If we plug in the values, we get m=400N/4.5m/s^2. The mass is 88.89kg. We know that the unit is in kg because one newton (N) is 1kg*m/s^2. The m/s^2 is cancelled out by the acceleration, and we are left with kg.
a sled with no initial velocity accelerates at a rate of 3.2 m/s squared down a hill how long does it take to sled to go 15 m to the bottom
Answers
Answer:
After 3.06secondsExplanation:
Given that the following data are
acceleration a= 3,2m/s^2
distance s=15m,
time t=?
Applying the formula for the equation of motion we have
s=ut+1/2at^2
we no initial velocity (u=0)
substituting our given values into the expression we have
15=0*t+1/2(3.2)t^2
15=1/2(3.2)t^2
15=3.2t^2/2
30=3.2t^2
t^2=30/3.2
t^2=9.375
Squaring both sides we have
t=√9.375
t=3.06seconds
It will take the sled 3.06 seconds to get to the bottom
Which device manages the flow of current in an electric circuit?
the wire
the switch
the battery
the light bulb
Answers
Answer:
b
Explanation:
Switch is the device that manages the flow of current in an electric circuit.
What is meant by current ?Current in a conductor is defined as the rate of flow of charge through the conductor per unit time.
Here,
An electric circuit consists of various components such as wire, switch, light bulb, battery, etc.
The wire is a piece of metal strand through which the current flows in an electrical circuit.
Switch is the device that controls the flow of current in an electric circuit by turning on and off mechanism.
Battery is the device that provides the necessary potential difference for the production of electrical energy in an electric circuit.
A light bulb is the device which is used to produce light from the electricity in an electric circuit.
Hence,
Switch is the device that manages the flow of current in an electric circuit.
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which equation according to ohms law
Answers
Answer: Ohm's law states that the voltage or potential difference between two points is directly proportional to the current or electricity passing through the resistance, and directly proportional to the resistance of the circuit. The formula for Ohm's law is V=IR.
What's your favorite
family/cultural tradition? Why is this tradition your
favorite?
Answers
Answer:
Every summer we go and work at a summer camp. My whole family loves it, and it's something that always brings us closer.
Explanation:
Christmastime is without a doubt my favorite time of year, not because of Christmas itself, but because of the atmosphere leading up to it. I've always felt this way, and I believe that is because of my grandmother. My Nanny was the same way. She loved Christmas, and went all out every year. Her house was put in the local newspaper several times because of all the lights and decorations she put up. If only they could have gone inside the house!
Anyway, there are a lot of things I did with my grandma around Christmas, and if I had been asked my favorite tradition when I was a young child, I might have said “decorating,” or “making Christmas treats,” but looking back, it is what we would do every Christmas Eve.
Christmas Eve is last-minute shopping day for the adults of my family, and the only shopping day for the kids. I would head out with my dad in the morning and shop, then go to lunch with my grandpa, and then finally, I would go with my grandma. We would shop a little, and then she would always buy some fake poinsettias. We would then travel to a tiny cemetery that seemed like an hour away back then, and I would walk with her to her father's grave.
Even as a young child, I felt the emotions in the air when we visited his grave. She never cried or showed any signs of sadness, but I could just sense how special the moment was to her. When her mother passed away in 2013, we went to visit both of them, and the atmosphere only intensified.
My grandma died in March of 2015 after a long battle with cancer. Every Christmas Eve, I buy the most beautiful poinsettias I can find, and visit her grave. It's always freezing outside, being December, but I stand for a few minutes, remembering, and then I get back in my car and head home.
My fondest tradition isn't the most fun, or the most festive. It's the one that means the most to me. One day, I hope I can take my children or grandchildren with me, and I hope they'll feel everything that I felt.
The mass of an unidentified rock is 15.5 grams. Students determine the volume of the rock by placing the rock in a cylinder with water. The students calculate the density of the rock. They determine the identity of the rock based on the density ranges in the table.
The students most likely have which type of rock?
Coal
Dolomite
Peridotite
Sandstone
Answers
Answer:
this density is in the range of Peridotite type rocks
Explanation:
In this graduated cylinder exercise we can directly read the volume of the rock
V = (35 - 30) cm³
V = 5 cm³
They also indicate the mass of the rock
m = 15.5 gr.
Density is defined as the ratio of mass to volume
ρ = 15.5 / 5
ρ= 3.1 gr /cm³
When checking the attached table this density is in the range of Peridotite type rocks
The type of rock the students mostly like have is Peridotite.
We'll begin by calculating the volume of the rock. This can be obtained as follow:
Volume of water = 30 mL
Volume of water + rock = 35 mL
Volume of rock =?Volume of rock = (Volume of water + rock) – (Volume of water)
Volume of rock = 35 – 30
Volume of rock = 5 mLFinally, we shall determine the type of rock the students have by calculating the density of the rock. This can be obtained as follow:Volume of rock = 5 mL = 5 cm³
Mass of rock = 15.5 g
Density of rock =?Density = mass / volume
Density of rock = 15.5 / 5
Density of rock = 3.1 g/cm³Comparing the density of the rock (i.e 3.1 g/cm³) with those given in table above, we can conclude that the rock is peridotiteLearn more: https://brainly.com/question/2040396
How do you find the range of a data set?
A. Subtract the smallest value from the largest value
B. Add the largest value to the smallest value
C. Add all the data values together
D. Subtract the smallest value from the average value
SUBMIT
Answers
The answer is A.
The answer is A.
The answer is A.
A force of 16 N to the west is applied to each object below. Which object will undergo the greatest change in momentum
Answers
A force of 16 N to the west is applied to each object below , the object with greater mass and velocity have greater momentum. So, A 20 Kg object that is moving east at 10m/s.
What is force?
Force is an external agent acting on a body, to change it from the state of rest or motion. There are various kinds of forces such as frictional force, magnetic force, nuclear force etc.
In physics, force is the product of mass and acceleration of the body. Greater mass results greater force needed to be applied on the object to make it move or stop.
Momentum is the product of mass and velocity. Thus, as mass or velocity or both increases, momentum of the object increases. Hence the larger object moving faster will gain greater momentum.
Here, option C is the correct answer.
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What is one other thing that needs to be controlled when testing the effect of particle size?
Answers
am sorry i thout this was my question not your answer sorry
temperature of the water must be controlled
PLEASE HELP :) <3
Describe some ways people can reduce the risks of being harmed by volcanoes and/or earthquakes.
Answers
Protection in a volcanic ashfall:
Stay inside, if possible, with windows and doors closed.
Wear long-sleeved shirts and long pants.
Use goggles to protect your eyes.
Keep your car or truck engine switched off.
Protection from earthquake if you're indoors:
Drop down and take cover under a desk or table
Stay inside until the shaking stops and it is safe to exit.
Stay away from bookcases and other furniture that can fall on you.
Stay away from windows and light fixtures.
If you are in bed – hold on and stay there.
Answer:
best way is to remain inside ur home or under any table
what is the definition of sewer?
Answers
Answer:
an underground conduit for carrying off drainage water and waste matter
Explanation:
Answer:
an underground conduit for carrying off drainage water and waste matter.
Explanation:
Which term describes the rate at which charge passes a point in a circuit?
O A. Voltage
O B. Power
O C. Resistance
O D. Current
Answers
Answer: D
The word that describes the rate is electric current. It is usually measured in amperes.
Amperes = Coulomb.
Hope it helps!
