I need someone to answer this quiz ASAP! Please QUESTION 1 The coefficient of st

Question

I need someone to answer this quiz ASAP! Please

QUESTION 1

The coefficient of static friction is generally less than the coefficient of kinetic friction.

True

False

1 points   

QUESTION 2

The coefficient of kinetic friction is general smaller than 1.

True

False

1 points   

QUESTION 3

The unit for the coefficient of kinetic friction is Newtons.

True

False

1 points   

QUESTION 4

Suppose a wooden crate of mass m= 10 kg is sliding on a horizontal surface and the coefficients of static and kinetic friction between the crate and the surface are s=0.4 and k=0.3. How hard must we push the crate to start it sliding across the surface? (Approximate the acceleration due to gravity as g=10 m/s2).

With a force greater than 10 N

With a force greater than20 N
With a force greater than 30 N
With a force greater than 40 N

1 points   

QUESTION 5

Suppose a wooden crate of mass m=7kg is sliding on a horizontal surface and the coefficients of static and kinetic friction between the crate and the surface are s=0.46 and k=0.36 If you push on the crate with a force F=83N, what will be the magnitude of the block's acceleration (in m/s2)? (Approximate the acceleration due to gravity as g=10 m/s2).

1 points   

QUESTION 6

A 157N box is onthe surface of the ground. A horizontal force of 74N is acting on the box but the box stays still. What is the friction acting on this box?

1 points   

QUESTION 7

In the previous problem why doesn't the box move?

That is just magic.

The applied force is less than the weight.

The applied force is less than the maximum of static friction.

The applied force is equal to the kinetic friction.

1 points   

QUESTION 8

The figure below shows data taken using the Pasco Smart Pulley with the procedure outlined in Experiment 05-B of your lab manual. From the data, assuming that the mass of the block is 200 g and the mass of the hanger is 120 g, what is the coefficient of friction between the block and the lab bench? (Approximate the acceleration due to gravity as g=10m/s2).

1 points   

QUESTION 9

The figure below shows data taken using the procedure outlined in Experiment 05-A of your lab manual. From the data, what is the coefficient of static friction between the block and the lab bench? (Approximate the acceleration due to gravity as g=10m/s2)

1 points   

QUESTION 10

The figure below shows force time data acquired similar to the procedure outlined in Experiment 05-A of your lab manual. Considering the friction force data (red line), at what point is it most likely that the block began to move?

Time (s)

A

B

C

D

Explanation / Answer

QUESTION 1 => False

QUESTION 2 => True

QUESTION 3 =>    False

QUESTION 4 =>    (d) With a force greater than 40 N

QUESTION 5 => Acceleration  = (F - k*m*g) / m

= (83 - 0.36*7*10) / 7 = 8.257 m/s^2

QUESTION 6 => The friction acting on the block = The force on the block = 74 N

QUESTION 7 =>   (c) The applied force is less than the maximum of static friction.

QUESTION 8 => The figure is not mentioned in the question. SORRY!!

QUESTION 9 =>   The figure is not mentioned in the question. SORRY!!

QUESTION 10 =>   The figure is not mentioned in the question. SORRY!!

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