Question II: friction. For problems 3 Suse the following: A worker pulls horizon

Question

Question II: friction. For problems 3 Suse the following: A worker pulls horizontally on a rope that is attached to a 10-kg crate on a level, rough floor. The coefficients of static and kinetic friction between the crate and the floor are 0.5 and 0.3, respectively. The crate is tially at rest. 3. (4 points) The worker pulls with a constant force of 40 N. The frictional force exerted by the surface on the crate a. 10 N b. 30N 40 N d. 50N e. 100 N 4. (4 points What minimum force is necessary to move the crate? a. 10N b. 30 N c, 40 N d. 50 N e. 100 N 5. (4 points) Now assume that the worker applies the minimum force necessary to move the crate. Once it starts moving, the crate motion is best described by a. Uniform linear motion b. Uniform circular motion c. Constant acceleration motion d. Jumping up and down e. The crate is not moving

Explanation / Answer

The weight = mg or (10kg)(9.8) = 98 N

so the normal force = 98N since f = (coefficient) * N f = 0.5 * 98 = 49N,

so the worker would need to pull with a force GREATER than 49 N in order to start accelerating the box,

but since he pulls with only 40N,

the force of friction will be equal to the pulling force.. so therefore F = force of pull = 40 N so F = 40N

Related Questions

Navigate

• Browse (All)
• Browse Q
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.