(a) (b) (c) What is the normal force between the ramp and the box? What is the force of friction between the ramp and the box? What is the acceleration of the box down the ramp?

(3) A stack of two crates is being lifted upwards by two cables, as shown in the figure below. The tension in each cable is 2270 N. You may assume that the masses of the cables are negligible compared to the masses of the crates. Do not use Newton's 3rd Law. (a) Using Newton's 2nd Law, calculate the force that the top crate exerts on the bottom crate and the force that the bottom crate exerts on the top crate. (answer: Fbottom-on-top = Ftop-on-bott -bottom= 3062 N) (b) The maximum tension that each cable can handle without breaking is 3230 N. Calculate the maximum upward acceleration that the load can have without breaking the cables. (answer: 8.97 m/s²) 232 kg 112 kg

In the figure, the coefficient of kinetic friction between the block and inclined plane is 0.23, and angle 0 is 53º. (a) What is the acceleration (including sign) of the block if the block is sliding down the plane? Take the direction down the plane to be the positive direction. (b) What is the acceleration (including sign) of the block if the block is sliding up the plane? Take the direction down the plane to be the positive direction. (a) Number Units (b) Number Units

A 5.0-kg box is on a horizontal surface. The coefficients of static and kinetic friction between the box and the surface are 0.40 and 0.20, respectively. A 15-N push is applied to the box horizontally, what is the friction on the box?

The coefficient of friction between the wheels of Dawson's 1985 Ford Coupe and the dry pavement is 0.85. Determine the acceleration which the 1300-kg Coupe experiences while skidding to a stop.

HW QI) Knowing that the coefficient of friction between the 25-kg block and the incline is µ = 0.25, determine (a) the smallest value of P required to start the block moving up the incline, (b) the corresponding value of B. P 25 kg 30° Q2) The coefficients of friction between the block and the rail are u. = 0.30 and le = 0.25. Knowing that 0=65°, determine the smallest value of P required (a) to start the block moving up the rail, (b) to keep it from moving down. 35° 500 N Q3) The coefficients of friction are . = 0.40 and ue = 0.30 between all surfaces of contact. Determine the smallest force P required to start the 30-kg block moving if cable AB (a) is attached as shown, (b) is removed. A 20 kg 30 kg

In a repair shop a truck engine that has a mass of 409-Kg, is held in place by four light cables. Cable A is horizontal, cables B and D are vertical and cable C makes an angle of 37.1° with the vertical. If the tension in cable A is 722-N, determine the tension in cables B and C.

The coefficient of friction between the wheels of Dawson's 1985 Ford Coupe and the dry pavement is 0.85. Determine the acceleration which the 1300-kg Coupe experiences while skidding to a stop.

The coefficient of static friction between a 2.0 kg box and a plane inclined 28° to the horizontal is 0.65. What maximum applied force can be exerted on the box without moving it?

The glue on a piece of tape can exert forces. Can these forces be a type of simple friction? Explain, considering especially that tape can stick to vertical walls and even to ceilings.