Two blocks with mass m2 > m1 are pulled as shown along horizontal surfaces, each at a constant speed v. Which tension force does more work moving the block a distance D along the surface?
1.T1
2.T2
3.Neither; both do zero work
4.Neither; both do the same amount of negative work
5.Neither; both do the same amount of positive work
6.Impossible to determine without knowing the masses
7.Impossible to determine without knowing the coefficients of friction
8.Impossible to determine without knowing the speed v
9.Impossible to determine for some other reason
[Ques. 2] In which of the following cases would you do the least amount of work?
1.You push a box a distance d across a floor.
2.You pick up the box, walk a distance d, and gently put the box down on the floor.
3.You pick up the box, walk a distance d, and drop the box.
4.Both 1 and 2 are the least.
5.Both 1 and 3 are the least.
6.Both 2 and 3 are the least.
7.The amount of work done is the same in all three cases.
8.The amount of work cannot be determined from information given.
[Ques. 3] Two blocks, M1 > M2, having the same speed, move from a frictionless surface onto a surface having friction coefficient k.
Which stops in the shorter time?
1. M1
2. M2
3. Both stop in the same time
4. Cannot be determined
[Ques. 4] Two blocks, having the same mass but different sizes, slide with the same constant speed on a smooth surface, then move onto a surface having friction coefficient k.
Which stops in the shorter time?
1. M1
2. M2
3. Both stop in the same time
4. Cannot be determined
[Ques. 5] A mass of 5 kg sits at rest on an incline making an angle of 30 to the horizontal. If s = 0.7, what is the friction force on the block?
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