A brick is resting on a rough incline as shown in the figure below. The friction force acting on the brick, along the incline, is Group of answer choicesless than the weight of the brick.there is not enough information to determinezero.greater than the weight of the brick.equal to the weight of the brick.

A brick slides on a horizontal surface. Which of the following will increase the frictional force on it?Group of answer choicesIncreasing the speed of the brick as it slidesIncreasing the surface area of contactDecreasing the mass of the brickDecreasing the surface area of contactPutting a second brick on top

Calculate the magnitude of the component of the brick’s weight that acts in a direction perpendicular to the slope.

A group of construction workers are building a house and want to lower an excess bundle of bricks that has a mass of 249 kg from the second story window to the ground. They tie one end of a rope to the bundle of bricks, loop it through a pulley and tie the other end to a 124.5 kg toolbox. If the coefficient of kinetic friction between the toolbox and the floor is 0.410, what is the acceleration of the bundle of bricks? 9.80 m/s2 0.530 m/s2 5.19 m/s2 15.6 m/s2

m The object of mass m = 3 kg is at the bottom of the incline, which is at the angle e = 55° with respect to horizontal. The object has initial speed of vo = 5 m/s and begins slide up the incline. There is a friction between the object and the incline. The coefficient of kinetic friction is uk = 0.25. The object moves up the incline and eventually stops under the influence of friction and its own weight. Find: (a) how high up the incline (in m, relative to its original position) the object slides before stopping (careful here - your answer is the height, i.e. the vertical distance between object's final position and the ground); (b) work in J) done by the kinetic friction when the object moves up the incline (careful with the sign); (c) work in J) done by the normal force when the object moves up the incline; (d) work in J) done by the gravity when the object moves up the incline (careful with the sign); (e) when the object reaches the highest point on the incline it begins to slide back down, find object's speed (in m/s) at the bottom of the incline.

A 10 kg box is on a concrete floor. You first push it with 2 N and the box does not move. Then you increase your force to 8 N and still the box does not move. Finally you apply 10.5 N and the box starts sliding on the floor. How much is the force of friction in each one of these cases, respectively. Group of answer choicesless than 2N, less than 8N, less than 10.5Nmore than 2N, more than 8N, 10.5N2N, 8N, less than 10.5N2N, 8N, 10.5Nmore than 2N, more that 8N, less than 10.5N