friction always acts____ and in the ____ direction of the motion of an object ​

Answers

Answer 1

Answer:

Friction force always acts tangent to the surface at points of contact. Friction force acts opposite to the direction of motion. There are 2 types of friction: Static friction: If the two surfaces in contact do not move relative to each other, one has static friction.


Related Questions

Which of the following is an example of rotation?
O A. The Moon traveling around Earth
O B. A car driving around a racetrack
O C. Earth traveling around the Sun
O D. An ice skater spinning in place​

Answers

D. An ice skater spinning in place

help me with this. its scienceee

Answers

Answer:

Imma say B

Explanation:

Question 6 (10 points)
The Washington Monument in our nation's capital is 555 ft high. Neglecting the effects of air resistance, what would be the
speed of the penny as it "hit" the ground?
оа
Ob
Oc
Od
48.3 m/s
-68.4 m/s
84.7 m/s
-57.6 m/s

Answers

Answer:

a= g = - 9.81 m/s2.

The following equations will be helpful:

a = (vf - vo)/t d = vot + 1/2 at2 vf2 = vo2 + 2ad

When you substitute the specific acceleration due to gravity (g), the equations are as follows:

g = (vf - vo)/t d = vot + 1/2 gt2 vf2 = vo2 + 2gd

If the object is dropped from rest, the initial velocity ("vi") is zero. This further simplifies the equations to these:

g = vf /t d = 1/2 gt2 vf2 = 2gd

The sign convention that we will use for direction is this: "down" is the negative direction. If you are given a velocity such as -5.0 m/s, we will assume that the direction of the velocity vector is down. Also if you are told that an object falls with a velocity of 5.0 m/s, you would substitute -5.0 m/s in your equations. The sign convention would also apply to the acceleration due to gravity as shown above. The direction of the acceleration vector is down (-9.81 m/s2) because the gravitational force causing the acceleration is directed downward.

hope this info helps you out!

Please help. I'll give brainliest :)

What happened to the supercontinents Columbia and Rodina?
They broke up and formed into the current land masses and
ocean floors.
The action of continental drift broke up Columbia an Rodina
into smaller continents.
The action of plate tectonics broke up Columbia and Rodina into
smaller continents.
They were formed before the process of plate tectonics began.

Answers

Explanation:

The choices aren't exactly correct. Technically, Rodinia pulled apart from tectonics, but then it slammed back together on the other side of the planet to form Pangea.

I guess C would be the closest correct answer.

Answer:

Is The First One-They broke up and formed into the current land masses and

ocean floors.

Explanation:

I Took The Quiz:)

Find the mass of an object moving at 20 m/s experiencing a momentum of 10
kg.m/s

Answers

Answer:

0.5 kg

Explanation:

The mass of the object can be found by using the formula

[tex]m = \frac{p}{v} \\ [/tex]

p is the momentum

v is the velocity

From the question we have

[tex]m = \frac{10}{20} = \frac{1}{2} \\ [/tex]

We have the final answer as

0.5 kg

Hope this helps you

Thor deja caer su martillo de la torre Torre Stark que tiene 95 pisos, si al llegar el Mjolnir al piso han transcurrido 9.5 segundos. Determina: a) La velocidad con la que el Mjonir golpea el suelo

Answers

Answer:

La magnitud de la velocidad con la que Mjonir golpea el suelo es 93.2 m/s.

Explanation:

Podemos encontrar la velocidad con la que el martillo golpea el suelo usando la siguiente ecuación:

[tex] v_{f} = v_{0} - gt [/tex]   (1)

En donde:

[tex] v_{f}[/tex]: es la velocidad final =?

[tex] v_{0}[/tex]: es la velocidad inicial = 0 (lo deja caer)

g: es la gravedad = 9.81 m/s²

t: es el tiempo = 9.5 s

Al reemplazar los valores anteriores en la ecuación (1), tenemos:

[tex] v_{f} = 0 - 9.81 m/s^{2}*9.5 s = -93.2 m/s [/tex]                

El signo negativo se debe a que el vector velocidad está dirigido hacia abajo en el eje vertical (y).

Por lo tanto, la magnitud de la velocidad con la que Mjonir golpea el suelo es 93.2 m/s.

Espero que te sea de utilidad!

what is the two kinds of solids in amorphous

Answers

Solids can be classified into two types: crystalline and amorphous. Crystalline solids are the most common type of solid. They are characterized by a regular crystalline organization of atoms that confer a long-range order. Amorphous, or non-crystalline, solids lack this long-range order.

Answer: Key Points
Explanation: Solids can be classified into two types, crystalline and amorphous. They are characterized by a regular crystalline organization of atoms that confer a long-range order.
Amorphous, or non-crystalline, solids lack this long-range order.

If this does not answer your question, we can have a conversation in the comments of this answer. Thank you.

PLEASE HELP!!!! What happens to cause the tissue around a cut to become swollen run and painful
O A .White blood cells burst and release wastes made by digesting pathogens.
O. B Fluid and white blood cells move into the tissue from nearby blood vessels
O. C Lymph nodes develop in the tissue and begin trapping pathogens
O. D Chemical messengers released by the tissue cause nearby muscles to contract and pull on bones

Answers

Answer:

the answer would be B

Explanation:

swelling is the result of the increased movement of fluid and white blood cells into the injured area.

You use a lever to lift a heavy tree branch. You apply a force of 30 N and the
lever lifts the branch with a force of 120 N. What is the mechanical advantage
of the lever?
A. 4
B. 0.25
C. 2
D. 90

Answers

Answer:

D 90 subtract it

Explanation:

A researcher changes the DNA in a soybean plant so that it produces offspring with a resistance to weed killer. Which best describes this scenario? genetic engineering gene therapy cloning selective breeding

Answers

Answer:

Genetic engineering

Explanation:

Genetic engineering or also called genetic modification is the direct manipulation of an organism's genome in order to bring about a desirable trait in such organism. In genetic engineering procedure, the organism manipulated is called TRANSGENIC or GENETICALLY MODIFIED (GM) organisms.

In this case, a researcher is said to change the DNA (genetic material) in a soybean plant so that it produces offspring with a resistance to weed killer. This describes a genetic engineering procedure in which the soybean plant is manipulated to yield a desired trait, which is resistance to weed killer.

Answer:

A. genetic engineering

Explanation:

I took the quiz

Which is the correct equation for the force applied by a spring?

Answers

Answer:

B. [tex]F = -k*x[/tex]

Explanation:

The force of a spring can be easily calculated using Hooke's law which tells us that the force applied on a spring is equal to the product of the constant of a spring by the compressed or stretched distance of the spring.

That is:

[tex]F = k*x[/tex]

k = spring constant [N/m]

x = distance [m]

You are trying to climb a castle wall so, from the ground, you throw a hook with a rope attached to it at 24.1 m/s at an angle of 65.0° above the horizontal. If it hits the top of the wall at a speed of 16.3 m/s, how high is the wall?

Answers

Answer:

The value is  [tex]h = 13.2 \ m[/tex]

Explanation:

From the question we are told that

    The speed of the rope with hook is [tex]u = 24 .1 \ m/s[/tex]

     The angle is  [tex]\theta = 65.0^o[/tex]

      The speed at which it hits top of the wall is  [tex]v = 16.3 m/s[/tex]

Generally from kinematic equation we have that

      [tex]v_y^2 = u_y ^2 + * 2 (-g)* h[/tex]

Here h is the height of the wall so

      [tex][16.3 sin (65)]^2 = [24.1 sin (65)] ^2+ 2 (-9.8)* h[/tex]

=>    [tex]h = 13.2 \ m[/tex]

A 5 kg ball is suspended on one cable. Calculate the tension in the cable

Answers

Answer:

49N

Explanation:

F=ma

We know the mass is 5kg, and since the ball is suspended on one cable, the acceleration is g, 9.8m/s^2

F=5kg*9.8m/s^2

 = 49N

Hope this helps!

Which of the following units are the Standard International units for
displacement?
A. Meters (m)
B. Meters per Second (m/s)
C.Meters per Second Squared (m/s2)
D. Seconds per Meter (s/m)

Answers

the answer is A. meters (m)

What is reflection of light and its laws ?​

Answers

Answer:

So, put simply, reflection is light bouncing off surfaces. The law of reflection determines how the light bounces off a surface. The law of reflection states that the angle of incidence is equal to the angle of reflection.

Hope this helps..

The law of reflection states that, on reflection from a smooth surface, the angle of the reflected ray is equal to the angle of the incident ray. (By convention, all angles in geometrical optics are measured with respect to the normal to the surface that is, to a line perpendicular to the surface.

Which type of wave transfers energy in the same way as a sound wave?
A
Radiation wave
B.
Seismic wave
C.
Heat wave
D.
Light wave

Answers

Answer:

Radiation wave

Explanation:

what is most likely being measured in the picture? A. the height of the cylinder.
B. the density of liquid.
C. the mass of th object.
D. the volume of the object

Answers

The density of liquid which the answer is b

Answer: volume of an object???

Explanation:

Your pulse is caused by pressure of the blood on the artery wall, and it corresponds to your heart beat.

A. true
B. false

Answers

weeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee true eeeeeeeeeeeeeeeeeeeee

Answer:

true

Explanation:

sorry if im wrong

How does the electric force between two charged particles change if the
distance between them is reduced by a factor of 2?
A. It is reduced by a factor of 2.
B. It is increased by a factor of 4.
C. It is increased by a factor of 2.
D. It is reduced by a factor of 4.

Answers

Answer:

increased by a factor of 4

Explanation:

Help please!!!
if superman at 90kg jumps a 40m building in a single bound how much work does superman perform

Answers

Answer:

5 years worth of work (aka all of the homework i currently have)

ANSWER RIGHT AND YOU WILL GET BRAINLIEST * A car is traveling with a constant speed of 20 m/s. If the car has a mass of 1300 kg, what is its kinetic energy?

Answers

Answer:

260,000 J

Explanation:

The kinetic energy of an object can be found by using the formula

[tex]k = \frac{1}{2} m {v}^{2} \\ [/tex]

v is the velocity

m is the mass

From the question we have

[tex]k = \frac{1}{2} \times 1300 \times {20}^{2} \\ = 650 \times 400 \\ = 260000[/tex]

We have the final answer as

260,000 J

Hope this helps you

Name the following ionic compounds: BeCl2​

Answers

Answer:

Beryllium chloride

Explanation:

I hope this helps!

Can I get branliest?!

what is the oxidation number of the noble gases such as xenon and argon?

Answers

Oxidation number for Xenon is XeOF2 and Argon is 0.

A rat runs 2m right, turns around and runs 3m left. Then goes 2m right. What is its displacement?

A. 1m right
B. 1m left
C. 7m
D. 7m left

Answers

Answer:

Explanation:

I think this answer would be 1m to the left.

What are the two things that make up water?

Answers

H20 is 2 hydrogen one oxygen :)


Hope this helps :))))

Answer:

hydrogen and oxygen (H2O)

Explanation:

thank u for the points i really appreciate it :3

Help me pretty please with a cherry on top!!

Answers

it doesnt show anything for me..


explaination :: cornje

Answer:

A. im not for sure hope it helps

Explanation:

A particle is moving with simple harmonic motion of period 8•0 s and amplitude 5•0 m Fine (A). The speed of the particle when it's 3•0 m from the centre of it's motion (B). The maximum speed (C). The maximum acceleration

Answers

Answer:

a. v(1.8) = -3.14 m/s

b. [tex]v_{max} = 3.925\ m/s[/tex]

c. [tex]a_{max} = 3.08\ m/s^2[/tex]

Explanation:

a.

The speed of a particle executing simple harmonic motion is given by the following equation:

[tex]v(t) = -A \omega \ Sin(\omega t)[/tex]

where,

v = velocity = ?

A = Amplitude = 5 m

ω = angular frequency = [tex]\frac{2\pi}{Time Period} = \frac{2\pi}{8\ s}[/tex] = 0.785 s

t = time

First we find time at 3 m by using equation for displacement:

[tex]x = 3\ m = ACos(\omega t)\\Cos((0.785 rad/s)(t)) = \frac{3\ m}{5\ m}\\t(0.785\ rad/s) = Cos^{-1} (0.6)\\t = \frac{0.927\ rad}{0.785\ rad/s}\\t = 1.18 s[/tex]

Therefore,

[tex]v(1.8) = velocity at 3\ m = -A\omega Sin(\omega t)\\v(1.8) = -(5\ m)(0.785\ rad/s)Sin((0.785\ rad/s)(1.18\ s))\\[/tex]

v(1.8) = -3.14 m/s

c.

The maximum speed is given as:

[tex]v_{max} = A\omega\\v_{max} = (5\ m)(0.785\ rad/s)\\[/tex]

[tex]v_{max} = 3.925\ m/s[/tex]

The maximum acceleration is given as:

[tex]a_{max} = A\omega^2\\v_{max} = (5\ m)(0.785\ rad/s)^2\\[/tex]

[tex]a_{max} = 3.08\ m/s^2[/tex]

A gun fires a bullet horizontally with a velocity of 90 m/s from a tower. Neglecting air resistance, how far will the bullet travel horizontally in 4 seconds?​

Answers

Answer:

The distance covered along the horizontal axis is [tex]s = 360 \ m[/tex]

The distance covered along the vertical  axis is  [tex]h = 78.4 \ m[/tex]

Explanation:

From the question we are told that  

    The horizontal velocity is  [tex]u_x = 90 \ m/s[/tex]

     The time considered is  [tex]t = 4 \ s[/tex]

Generally the distance which the bullet will cover in the horizontal direction for the given time is  mathematically represented as

    [tex]s = u_xt + \frac{1}{2}* at^2[/tex]

Here a is the acceleration along the horizontal direction and the value is  [tex]a = 0 \ m/s^2[/tex]

So

     [tex]s = 90 * 4 + \frac{1}{2}* * 0 * 4^2[/tex]

=>  [tex]s = 360 \ m[/tex]

Generally the distance which the bullet will cover in the vertical  direction for the given time is  mathematically represented as

            [tex]h= u_y t + \frac{1}{2}* gt^2[/tex]

Here  [tex]u_y[/tex] is the initial  velocity of the bullet along the vertical axis and the value is  [tex]u_y = 0 \ m/s[/tex]

             [tex]h = 0 * 4 + \frac{1}{2}* 9.8 *4^2[/tex]

=>          [tex]h = 78.4 \ m[/tex]

 

Which unmanned craft is used to collect data about bodies in space?

Answers

Answer:

space probe

Explanation:

Answer:

Space probe

~+ lil more info+~

Space probe is the unmanned craft used to collect data about bodies in space. Space probe is any unmanned, unpiloted spacecraft that is created to explore space and collect scientific data.

can i have brainlist? :)

PLEASE HELP

A particle travels in a circle of radius 76 cm and completes one revolution in 4.5 s. What is the centripetal acceleration of the particle?

A. 2.8 m/s2

B. 1.5 m/s2

C. 0.97 m/s2

D. 3.3 m/s2

Answers

Answer:

option no B is the snswer

B is the answer!!!!!!!!!!!!!!!!!!!!!
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Can someone help me plz?!?!? The real answer too 12. Who was the leader of the Hessians who was given a letter informinghim that Washington was planning to attack, but he put the letter in hispocket and never read it?* example of rotatory motion What is the 9 amendment Which of these inferences about the Highway Beautification Act of 1965 is best supported by the text? 2. To "conjugate" a verb means:to use it correctlyto make it agree with the subjectto put it in the sentence Given: f(x) = x - 7 and h(x) = 2x + 3Write the rule for f(h(x)) what fraction is equal to 5% Benet Company has budgeted the following unit sales: 2019 2020 Quarter Units Quarter Units 1 1105,000 1 4120,000 2 190,000 3 260,000 4 375,000 The finished goods inventory on hand on December 31, 2018 was 21,000 units. It is the company's policy to maintain a finished goods inventory at the end of each quarter equal to 20% of the next quarter's anticipated sales. Prepare a production budget for 2019. just help please, im the NOT smartest Solve for x: (-3/2)x-9=-27- 24-121112 The invention of new ways of irrigation had the BIGGEST impact in ancient Egypt on? Who is most likely the speaker in "Youth's the Season Made for Joys"? fill in the blank with the word that best completes the sentence: someone from los estados unidos is called ___ what is the balanced equation of K3PO4 + HCI -> KCI + H3PO4? Raccoons living in cities have learned to open the lids of garbage cans. Thisis an example of an?O Physiological adaptationsO Structural adaptationsO Behavorial adaptationsO Selective breeding Who's is the faster runner? Raj can run 1 1/3 laps in 1/4 of an hour. Yvonne can run 4 1/2 laps in 7/8 of an hour. simplify (-45) (-9) 1. The bones that form a cage around the chest are called rib cage2. The longest bone in the body is called thefemur3. The general term for all of the bones in the head is4. The spinal column is made of many small veterbraestacked on top of each other.5. The longest bone in the arm is the6. The common name for the scapula is the7. How many bones are in each wrist?They are the carpals.8. The bones that make up the palm of your hand are called,OL What has more energy a 2 kg mass at 10 m/s or a 2 kg mass 5 m above the ground