Suppose you have a 120 kg wooden crate resting on a wood floor, with coefficient of static friction 0.500 between these wood surfaces. (a) What maximum force can you exert horizontally on the crate without moving it? (b) If you continue to exert this force once the crate starts to slip, what will its acceleration then be? The coefficient of sliding friction is known to be 0.309 for this situation.
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- Our 10kg mystery box rests on a horizontal floor. The coefficient of static friction is 0.40and the coefficient kinetic friction is 0.30. Determine tge force of friction, acting on the box if a horizontal applied force is exerted on it of magnitude: (a) 0, (b) 10N, (c) 20N (d) 38N, and (e) 40N.Suppose you have a 120-kg wooden crate resting on a wood floor, with coefficient of static friction 0.500 between these wood surfaces. (a) What maximum force can you exert horizontally on the crate without moving it? (b) If you continue to exert this force once the crate starts to slip, what will its acceleration then be? The coefficient of sliding friction is known to be 0.300 for this situation.A 3.0 kg block of wood sits on a horizontal wooden floor. The larges force that can be applied before it starts moving is 14.7 N. Once the block starts moving, you only need 8.8N to keep it moving. (a) What is the coefficient of static friction? (b) What is the force of friction acting on the block if you push with a force of 6.8N [E]? (c) Calculate the max static friction if you place a 2.1 kg on top of it (d) What is the kinetic coefficient of friction?
- A 0.85 kg block of wood is stationary on an incline that is15◦above horizontal. A force of 3.0 N is being applied toit 75◦below horizontal, directly into the incline (the force isperpendicular to the incline). What is the minimum coefficientof static friction required to keep the block stationary?A 50.0-kg box rests on a horizontal surface. The coefficient of static friction between the box and the surface is 0.300 and the coefficient of kinetic friction is 0.200. What is the friction force on the box if(a) a horizontal 140-N push is applied to it?(b) a horizontal 175-N push is applied to it?A box with a mass of 0.5 slugs lies on an inclined plane making an angle of 30o with the horizontal. If the coefficient of kinetic friction between the box and the plane is 0.4, what is the magnitude of the force that must be applied parallel to the incline to keep the box moving down the incline at a constant speed?
- You are climbing on a hill that is inclined at 15degrees with the horizontal and you wish tobuild a rope tow to pull yourself up. Ignoring friction, calculate the tension you needed on therope to give your body that has a mass of 45kg a 1.5 m/s^2 acceleration. What if you are toconsider the friction of 100N, what is the value of the tension and coefficient of friction?A man exerts a horizontal force of 125 N on a crate with amass of 30.0 kg. (a) If the crate doesn’t move, what’s the magnitudeof the static friction force? (b) What is the minimumpossible value of the coefficient of static friction between thecrate and the floor?Shoes made for the sports of boulderingand rock climbing are designed to provide a great deal of frictionbetween the foot and the surface of the ground. Such shoes on smoothrock might have a coefficient of static friction of 1.2 and a coefficient ofkinetic friction of 0.90. If the person steps onto a smooth rock surface that’s inclined at an angle large enough that these shoes begin to slip, what will happen? (a) She will slide a short distance and stop; (b) she will accelerate down the surface; (c) she will slide down the surface at constant speed; (d) we can’t tell what will happen without knowing her mass.
- Two boxes (Box A = 9.7 kg and Box B = 5.4 kg) are connected by acord running over a pulley. The coefficient of kinetic friction betweenbox A and the table is 0.18. We ignore the mass of the cord and pulleyand any friction in the pulley, which means we can assume that a forceapplied to one end of the cord will have the same magnitude at theother end. We wish to find the tension of the cord while accelerating (inN), assuming the cord doesn’t stretch. As box B moves down, box Amoves to the right. Hint: Solve for the acceleration of the system first.Suppose you have a 100-kg box full of books resting on a wood floor, with coefficient of static friction 0.500 between these surfaces. A force is applied at an angle of 30° with respect to the horizontal, as shown. M (a) What is the minimum force would you need to exert on the box to get it to move? (b) If you continue to exert this force once the box starts to slip, what will be its acceleration? The coefficient of sliding friction is known to be 0.300 for this situation.a mass is given an initial velocity v0= 3.4ms up a 15 degree incline. a) if the coefficient of kinetic friction between the mass and the incline is 0.25, how long before the mass comes to rest? b) if the coefficient of static friction is 0.29, will the mass slide back down the incline?