Please answer #6-9 show all work thank you! Worksheet assignment ch 7 A force is

Question

Please answer #6-9 show all work thank you!

Worksheet assignment ch 7 A force is applied to a crate at an angle of 25. The crate is dragged across the deck a distance of 25m If the amount of work done after it has been moved is 1 210 J, what was the applied force? This is a simple problem; all we have to do is solve it for F 1210 N 530 N rcost 2.529 Work is a scalar quantity. This means you can add and subtract work without treating it as a vector. Your turn: Marcy pulls a backpack on wheels down the 100-m hall. The 60-N force is horizontal How done by Marcy? How much wark is done if the force is applied at an angle of 60 above the harizontal? 4. uch work is 5 The brakes af a truck cause it to slow down by applying a retarding force of 3.0x103 N to the truck over a distance of 850 m. What is the work dane by this force on the truck? Is the wark positive or negative? Why? In the figures below, identical boxes of mass 10 kg are moving at the same initiall velocity to the right on a ft surface. The same magnitude force.F.is applied to each hos for the distance, d. indicaiod in the figures d-10m d= 10m Rank the work done on the box by F while the bos moves the indicated distanee. OR AllCam Greatest the same o deermine Explain your reasoning. Page 2 of 4

Explanation / Answer

6)We know that

W = Force x distance = F d

If force is applied at an angle

F = F d cos(theta)

So the ranking will be:

B > A > C > D = F > E

Explanation:

mass is same, Force is same in magnitude, d is greatest in b. Now C and A have same value of all but the force is applied at an angle.

The force is applied in perpendicular direction direction, cos90 = 0; for F the same.

In E the force is applied in apposite direction as required so a negative work will be done.

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