If you push a book against a wall hard enough, it will not slide down even though gravity is pulling it. Use what you know about Newton’s laws of motion to explain why the book is not falling. (giving away brainliest!)

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Answer 1

Answer: Frictional force is defined by the following formula -

f = coefficient of friction (u) X Normal reaction exerted by the surface (N)

So, f = u X N.

Now 'u' is a constant for given surfaces in contact ( keep in mind that it depends on both the surfaces that are in contact with each other, here wall and the book that you are pressing)

Now, Normal reaction is equal and opposite to the force exerted by an external force on the surface, PERPENDICUAL TO THE SURFACE ( or the perpendicular component of the external force). The external force exerted on the surface which is vertical to it, in this case, is equal to the force that you are applying while you are holding/pressing the book against the wall.

So, at any point of time, frictional force = u X (Force you are applying on the surface, via the book)

Or, f = u X F, where,
f = frictional force,
u = coefficient of friction, and
F = Perpendicular component of the force exerted by you on the book towards the surface.

Now direction of f -
Frictional force always act parallel to the surface and in opposite direction to the direction of motion.

In absence of friction, book will fall down, because of gravity acting on it. So friction will try to act in the opposite direction of this motion. So, upwards in this case.

If let's say you have a metal object placed between magnets, which is applying more force on it than gravity, in upwards direction; and you try to press it against the wall, the motion of object will be upwards, so friction will then act downwards.

Friction always opposes the direction of motion in which the object would have moved because of RESULTANT FORCE on it in absence of friction.

Takeaways in English (or, common observation) -
1) Harder you press the book against the wall, harder it will be for a person to move the book on the surface of the wall, while you are pressing it. Because of higher friction.

2) The more you move the book on the wall, while keep on pressing it, warmer the surface of the book which is in contact with wall will be. Because if more energy is dissipated per second to overcome friction, which gets converted to heat energy.

2.1) Harder you press, book will heat up faster.

3) Harder you press the book against the wall, lesser chance are that it will fall down. Because more frictional force is now acting on it to hold it against gravity.

4) Heavier the book, more frictional force is needed to hold it from falling, and that is why you have to press it harder to hold Heavier books.

5) That is all I can think of right now. Try applying this concept in things you see around.
12.8K viewsView 6 Upvoters · Answer requested by Muhammad Shouman
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How does the charge not originate in a battery?

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The charge in a battery does NOT come from tiny tiny men inside the battery turning microscopic electric generators.

What is the difference between the way matter responds to a transverse wave and a longitudinal wave?A. Matter moves in the same direction in a longitudinal wave, and at right angles to the direction of a transverse wave.
B. Matter moves at right angles to the direction of a longitudinal wave, and at right angles to the direction of a transverse wave.
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Answer:

Explanation:

Transverse waves cause the medium to move perpendicular to the direction of the wave. Longitudinal waves cause the medium to move parallel to the direction of the wave.

What does the sun provide in the water cycle?

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A runner runs a 1,500 m race on a circular track. The runner stops 100 m from the starting point. What are the distance and displacement traveled by the runner

Answers

The distance and displacement traveled by the runner are respectively 1400 m and 100 m.

What are distance travelled and displacement?

Distance is the sum of an object's movements, regardless of direction. Distance can be defined as the amount of space an object has covered, regardless of its starting or ending position.

The term "displacement" refers to a shift in an object's position. It is a vector quantity with a magnitude and direction. The symbol for it is an arrow pointing from the initial location to the ending place.

The runner runs a 1,500 m race on a circular track and he stops 100 m from the starting point.

hence, total distance travelled by the runner = 1500 m - 100 m = 1400 m.

The magnitude of displacement traveled by the runner = difference between initial position and final position

= 100 m.

Learn more about displacement here:

brainly.com/question/11934397

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Answer:

distance- 1400 m

displacement- 100 m before the finish line

Explanation:

A square block of steel with volume 10 cm3 and mass of 75 g is cut precisely in half. The density of the two smaller pieces is now...a. the same as the original density.
b. one-half the original density.
c. two times the original density.
d. one-fourth the original density.

Answers

a. Density only depends on the substance. It doesn't matter whether you have a little chip of it or a supertanker full of it ... the density doesn't change.

Answer:

a. the same as the original density.

Explanation:

The density of a material depends only on the properties of the material, so if a block of steel is cut in a half, it is still made of the same material (steel), so it still has the same density.

We can verify it by doing some calculations. In fact, the initial density of the block of steel is given by the ratio between its mass (75 g) and its volume (10 cm^3):

$d=(m)/(V)=(75 g)/(10 cm^3)=7.5 g/cm^3$

When the block is cut in a half, its mass becomes half:

$m' = (m)/(2)=(75 g)/(2)=37.5 g$

and its volume also becomes half:

$V'=(V)/(2)=(10 cm^3)/(2)=5 cm^3$

So the new density is

$d'=(m')/(V')=(37.5 g)/(5 cm^3)=7.5 g/cm^3$

So, the density has not changed.

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