In Question 12, assume that friction is so small that it can be ignored 12. (6 p

Question

In Question 12, assume that friction is so small that it can be ignored 12. (6 pts) The spring scale in the diagram below reads 12.0 N. If the cart moves toward the right with an acceleration also toward the right of 4.50 m/s2, what is the mass of the cart? Show your calculations In the next two question, friction may not be ignored 13. (10 pts) The force applied to the cart by the spring scale is still 12.0 N. The car now moves to the right with an acceleration to the right of 3.5 m/s. What are the magnitude and direction of the frictional force? 14. (5 pts)The force applied to the cart in Question 12 by spring scale is still 12.0 N. The cart now moves toward the right with a constant velocity. What are the magnitude and direction of the frictional force? Show your calculations. 15 (5 pts) What is your lab instructor's name? (First and or Last) Page 5 of 5

Explanation / Answer

12)

F1 = 12 N

As F = ma

So, m = F/a =12/4.50 = 2.66 kg

13)

As the two forces act on the body,

Thus , F1-f = ma <----here f = friction force, m = mass, a=accleration=3.5 m/s2

So, 12-f = 2.66*3.5

So, f = 2.69 N <------magnitude

dirction = toweards left

14)

B)

As the velocity of cart is constant, so there is no acceleration, thus there is no force

So, force of friction must be equal and opposite to F1

So, friction = F1 =12 N <------magnitude

direction = opposite to F1 = towards left

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