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The equations for physics?
Hello,
I am doing physics work, and it has been a problem subject for me.
More than anything, I want to know how to do the problems I post on here, and I don't want to just know the answer.
1. The coefficient of static friction between a 4 kg block and a table is 0.4. Which of the following statements is correct if the block is pulled by a force of 6 N?
- The block moves with an acceleration of 3.92 m/s2.
- The block moves with an acceleration of 1.5 m/s2.
- The block will not move at all.
- The block moves with constant speed.
I thought the answer to this would be that the block will not move at all because the static frictional force is 15.68 N (4kg * 0.4 * 9.8) and there is only 6N being applied to it.
2. The frictional force acting on a 0.5 kg object and a floor is 3 N. What is the coefficient of friction between the object and the floor?
I think the answer is 0.6 because Fk = u (FN)
3 = 0.5*9.8 * u
3/4.9 = 0.6
3. Pushing a body of 2.5 m on a rough floor constitutes 10 J of work. Which of the following statements is correct?
- Applied force on the body is 4 N.
- Net force on the body is 4 N.
- Applied force on the body is 25 N.
- Net force on the body is 25 N.
I think the answer is Applied force on the body is 4N because work = force * displacement
10J = F(2.5)
F = 4N
