7. A 5.50 kg block is pressed against a vertical wall by a force (F), as shown in the figure below. The coefficient of static friction between the block and the wall is 0.42 and the directional angle @ for the force is 36.0°. Determine the magnitude of the force (F) when the block is about to slide down the wall. x 95.910 N Lano

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5. (a) The weight of the block in the diagram is 54 N. The coefficient of static friction between the block and the vertical wall is 0.570. What minimum magnitude of the force F is required to prevent the block from sliding down the wall? (Note that the static frictional force is directed upward, parallel to the wall) Block F40.0° Vertical wall (b) A 104 kg baseball player slides into second base. The coefficient of kinetic friction between the player and the ground is μ = 0.651. (i) What is the magnitude of the frictional force? (ii) If the player comes to rest after 1.13 s, what is his initial speed?

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A sled is on a horizontal surface and a rope with tension T is pulling on it at an angle 0 above the horizontal. The sled had mass M and does not move due to the frictional force. In this case the coefficient of friction is µ̟. In terms of the variables given and g, what is the magnitude of the frictional force in this case? Select one: a. H, Mgsino b. Tcose O c. Tsin0 O d. H, Mgcos0

11. A 6.0 kg block sits at rest on a 25° inclined plane. If this is the steepest the ramp can be before the block slides, determine the coefficient of static friction between the block and plane. 0.89 0.29 0.68 0.47

A mass m is being pushed by a horizontal force F of magnitude 209.0 N. The coefficient of kinetic friction between the two surfaces is 0.4. What is the magnitude of the acceleration of this mass as it gets to be pushed up the ramp?

3. A 6.50 kg block is pressed against a vertical wall by a force (F), as shown in the figure below. The coefficient of static friction between the block and the wall is 0.41 and the directional angle 0 for the force is 46º. Determine the magnitude of the force (F) when the block is about to slide up the wall. N F é

A100-kg sofa needs to be moved across a level floor. The coefficient of static friction between the sofa and the floor is 0.40. Two physics students decide to apply a force F!" on the sofa. One student recommends that the force be applied upward at an angle theta above the horizontal. The other student recommends that the force be applied downward at an angle theta below the horizontal. Explain which student has the better idea and why.

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