QUESTION 1 between them Friction between two surfaces is caused by the sharing o

Question

QUESTION 1 between them Friction between two surfaces is caused by the sharing of 1 electrons 2.protons 3.moeoules 4. gtoms QUESTION 2 The constant value that relates the relative "stickiness between two materiais is called theffction o 1. constant 2.co efficient 3. index 4.force QUESTION 3 Which force s a varable force that will match any opposing force up to some maximum value? gravitational force state friction knatio friction magnetic force QUESTION 4 A block s siding so the right across a rough table. The force of kinetc tretion is 4 N to the let. To keep the block moving at a constant vejoc ty, what other force must be presene? 2 a force of exacty 4 N to the right o 3-a force of exacty 4 N to the eft 4 a force less than 4 N to the left QUESTIONS A 10 N boox is sidng horzonta y across a desk and exper ences a frictional force of 4 N The ccefficent of kinetc frct on between the book and the surface s 1.40 2.2.5 4.0.4 Click Save and Subrsit to save and submir Chick Save Al Aneers to save all aneers

Explanation / Answer

1.

friction between two surfaces is caused by the sharing of MOLECULES between them.

2.

The constant value that relates the relative "stickiness between two materiais is called COEFFICIENT of friction.

3.

STATIC FRICTION is a varable force that will match any opposing force up to some maximum value, it will stop working when object starts moving.

4.

Since given that block is moving at constant velocity, which means net acceleration of object is zero

Fnet = F1 + F2

m*a = F1 + F2

Since a = 0, So

F1 + F2 = 0

F1 = -F2

Since F1 is towards the left, So F2 will be towards right.

So F2 = a force of exactly 4 N to the right.

Correct option is B.

5.

Friction force is given by:

Ff = uk*N = 4 Newton

N = normal Force = Weight of book = 10 Newton

uk = Coefficient of kinetic friction

uk = Ff/N

uk = 4/10 = 0.4

Correct option is D.

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