5) Two crates connected by a rope lie on a horizontal surface as shown in the figure. Crate A has mass mA, and crate B has mass mg. The coefficient of kinetic friction between each crate and the surface is HAK and HBk for crates A and B respectively. The crates are pulled to the right at constant velocity by a horizontal force F. B A F

1) The figure below illustrates a large block having mass M positioned on a horizontal frictionless surface. A small block having mass m is positioned against the large block such that vertical surfaces of the two blocks are in contact with each other and they have a coefficient of static friction (us). An external agent applies a constant horizontal force (magnitude = F) onto the small block in the direction of the large block so as to prevent the small block from sliding downwards. Determine an expression {M, m, Hs, g} for the minimum F, such that if F is less than this minimum, the small block will slip downward relative to the large block. F M Frictionless

A 5.0 kg block remains stationary on an inclined surface. What is the friction force acting on the block? a) 44 N b) 23 N c) 21 N d) 49 N 25° (

A 2N force acts on a 10N block that is initially at rest on a horizontal surface. The coefficient of static friction between the block and the surface is 0.50.  What is the magnitude of the frictional force on the block? A)0N, B)2N, C) 5N, D)8N, E)10N