I need help with physics Work, Forces, and Newton\'s laws problems. Help me unde

Question

I need help with physics Work, Forces, and Newton's laws problems. Help me understand these concepts ):

Problem 6 In the following, ignore air resistance. Let Wup be the work done by gravity on an object which is thrown straight upwards from height h and caught at the same height h. Let Wover be the work done by gravity on an object which is thrown from height 2h at an angle and caught at height 2h a distance L away. Which is greater, Wup or Wover? Problem 7 A mass m is adjoined to the end of a spring (you don't know the spring constant - let's call it k), which is oriented so as to point at a frictionless loop-de-loop of radius r (which you do know), as shown below. If the spring is compressed a distance and released, the mass slides up and around the loop. If the speed of the mass at the top of the loop is half of the speed with which it departed from the spring, what is k? Problem 8 Three blocks, with masses M1, M2, and M3, are sitting on a table, as shown below. You apply a force F onto the leftmost block. The coefficient of static friction between the table and each of the blocks is /m2 a) Draw a free body diagram for each of the three blocks b) Suppose no blocks are moving. What is the smallest ,18 could be so that there will be no horizontal forces acting on the rightmost block?

Explanation / Answer

Problem 6:

Wup= F*d

Wup= mg*y

Wup= mg*(h-h)

Wup= mg*0

Wup= 0 J

Wover= F*d

Wover= mg*y

Wover= mg*(2h-2h)

Wover= mg*0

Wover= 0 J

Thus Wup=Wover= 0

Thus both works are equal

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