A box rests on a horizontal surface. You apply a force on the box of F = 100 N at an angle, θ, below the horizontal and it slides at a constant velocity.  The friction force that acts on the box is?

A 250 gram block on a 30 deg inclined plane is attached by an inextensible string going over a frictionless pulley to a 500 gram hanging weight. The static and kinetic friction coefficients are .25 and .123. While moving, what is the tension ii the connecting string? O 174530 dynes O 121000 dynes O 262400 dynes O 7430 dynes O 42930 dynes

Two blocks are positioned on surfaces, each inclined at the same angle of 40.9 degrees with respect to the horizontal. The blocks are connected by a rope which rests on a frictionless pulley at the top of the inclines as shown, so the blocks can slide together. The mass of the black block is 2.37 kg, and the coefficient of kinetic friction for both blocks and inclines is 0.500. Assume static friction has been overcome and that everything can slide. What is must be the mass of the white block if both blocks are to slide to the LEFT at an acceleration of 1.5 m/s^2?     0.87 kg     22.68 kg     11.66 kg     0.96 kg

A Box is placed on a 40° slope with a coefficient of friction of 0.30. The box starts approximately at 6.0m off the ground. It slides onto a horizontal part with a coefficient of 0.45. How far does it slide along this part?

A box has a mass of 31 kg. A force of 163 N is applied to it at an angle of 45º. An object moves along a surface 15 m with a coefficient of kinetic friction of 0.09 and where its initial velocity is equal to 16 meters/sec. along this path: Determine the magnitude of the friction force.

The rock is hanging from the middle of a clothesline. The rope is attached at equal heights 24 units apart and the entre point sags 1 unit below them. What is the tension if he has a mass of 20kg?

An object of mass 50kg is pushed in the +x direction with a force of 40N flat along a horizontal surface causing a net acceleration of 0.15m/s2 in the +x direction.  What is the coefficient of kinetic friction between the surface and the object?

When a force of 15 newtons is applied to the 0.50 kg book, the friction keeps the book from sliding down the wall. What is the minimum force and minimum coefficient of friction to keep the book from sliding?

A 1.2 kg crate slides down a 300 ramp with a height of 2.77. The crate has a speed of 2.90 m/s at the bottom of the ramp. The ramp is 5.8 m long. What is coefficient of kinetic friction?

The coefficient of static friction between a rubber tire and dry pavement is about 0.800. Assume that a car's engine only turns the two rear wheels and that the weight of the car is uniformly distributed over all four wheels. What limit does the coefficient of static friction place on the time fmin required for a car to accelerate from rest to 50.0 mph (22.4 m/s)? Imin = How can friction accelerate a car forward when friction opposes motion?