QUESTION 23 A block is at rest on a rough inclined surface as shown in the figure. Which of the following statements is true about the force of friction acting on the block? O The force of friction acting on the block is less than the force of gravity acting on the block The force of friction acting on the block is proportional to the normal force acting on the block The force of friction acting on the block is greater than the force of gravity acting on the block The force of friction acting on the block is equal to the force of gravity acting on the block

The 118-lb force P is applied to the 250-lb crate, which is stationary before the force is applied. Determine the magnitude and direction of the friction force F exerted by the horizontal surface on the crate. The friction force is positive if to the right, negative if to the left. Assume ??= 0.48, ??= 0.38.

A crate remains stationary after it has been placed on a ramp inclined at an angle with the horizontal. Which of the following statements must be true about the magnitude of the frictional force that acts on the crate? O It is least equal to the weight of the crate. O It is equal to n. O It is larger than the weight of the crate. O It is greater than the component of the gravitational force acting down the ramp. O It is equal to the component of the gravitational force acting down the ramp.

Block 1 (10 kg) is pulled by a rope from left to right up a ramp which is inclined 50 degrees from the horizontal. The rope pulls on block 1 with a force of 150 N parallel to the surface of the inclined plane. The coefficient of kinetic friction between the block and the surface equals 0.3. Weight force on block 1 by EarthW1E =  i +  j N Tension force on block 1 by RopeT1R =  i +  j N Normal force on block 1 by SurfaceN1S =  i +  j N Frictional force on block 1 by Surfacef1S =  i +  j N What is the acceleration a of block 1?a =  i +  j m/s2

You push downward on a trunk at an angle 25° below the horizontal with a force of  750N If the trunk is on a flat surface and the coefficient of static friction between the surface and the trunk is 0.61, what is the most massive trunk you will be able to move?     93 kg     81 kg     112 kg     73 kg

Consider the following statement: “The normal force on an object is always equal to the weight of the object.”Select all the reasons that this statement is false .       The normal force is not always parallel to the force of gravity     The normal force is independent of the force of gravity     The normal force is only equal to the weight of the object when sitting on a horizontal surface and there are no other forces in the y-direction except gravity     The normal force causes an acceleration and therefore does not interact with gravity