A 200 kg crate rests on a floor with carpet. A tired worker pushes with a horizontal force of 600 N on the crate initially resting on a thick pile carpet. The coefficients of static and kinetic friction are 0.60 and 0.40, respectively. Find the magnitude of the frictional force exerted by the surface of the crate by the carpet. Hint: Which type of friction acts in this case? What are the properties of different kinds of friction? O 1176 N 784 N O 600 N 1960 N O 500 N

A physics major is cooking breakfast when he notices that the frictional force between the steel spatula and the Oiled Steel frying pan is only 0.150 N. Knowing the coefficient of kinetic friction between the two materials (0.03), he quickly calculates the normal force. What is it? N

A box of mass mb is being blown by a strong steady wind across the level surface of a picnic table. The wind exerts a constant horizontal force of magnitude Fwb. As the block slides it accelerates with a magnitude ab. Assuming that kinetic friction is acting, develop an expression for the coefficient of kinetic friction µk between the box and table. Your final answer should be in terms of mb, Fwb, ab and g.

The coefficient μ of kinetic frictions depends on the surfaces in contact and their conditions, while the coefficient μ of static frictions does not depend on the surfaces conditions. a) Trueb) False

Calculate the magnitude of a normal force on a 22.7 kg block in the following circumstances. a. the block is resting on a level surface. b. the block is resting on a surface tilted up at 40.8 degrees with respect to the horizontal. c. the block is resting on the floor of an elevator that is accelerating upward at 2.53 m.s^2 d. the block is on the level surface and a force of 115 N is exerted on it at an angle of 40.8 degrees below the horizontal.

You are lowering two boxes, one on top of the other, down a ramp by pulling on a rope parallel to the surface of the ramp as shown below. Both boxes move together at a constant speed of 13.1 cm/s. The coefficient of kinetic friction between the ramp and the lower box is 0.374, and the coefficient of static friction between the two boxes is 0.793. a. What force do you need to exert to accomplish this? b. What are the magnitude and direction of the friction force on the upper box? 32.0 kg 48.0 kg 2.50 m 4.75 m e on te

A 20 kg box is released from rest from the top of a 15 m long inclined plane, which is angles 30 degrees above the horizontal. Assuming there is friction between the ramp and the wagon, how is this frictional force affected if the angle of the inclined plane is increased? O The frictional force increases. O The frictional force stays the same. O The frictional force decreases. O The frictional force cannot be determined with the given information.

A 18kg crate is pushed across the floor, using a force that makes an angle of 21 degrees with the horizontal. The coefficient of static friction between crate and floor is µs=0.45. The coefficient of kinetic friction between crate and floor is µk=0.20. a) What magnitude of pushing force is required to just start the crate sliding? b) Once it has started sliding, if you continue to push the crate with the same amount of force found in “a”, what will its acceleration be?

A 620  kg packing crate is being pulled up a 16 degrees-inclined plane by a rope. The rope is parallel to the incline. The coefficient of kinetic friction is 0.3. (a) What is the size of the normal force acting on the crate? N (b) What is the size of the kinetic friction force acting on the crate? N (c) What is the size of the tension force if the crate is moving with constant velocity?

You are trying to slide a heavy trunk across a horizontal floor. The mass of the trunk is 85kg, and you need to exert a force of 3.3*10^2 N to make it just begin to move. a)Determine the coefficient of static friction between the floor and the trunk.b)After the trunk starts moving, you continue to push with this force. The trunk reaches a speed of 2.0m/s after 5.0s. Calculate the acceleration of the trunk if the coefficient of kinetic friction between the trunk and the floor is 0.32.