1. A box 35Kg sits at rest on a ramp with angle 29deg with horizontal direction, the friction force on box is 200N. Draw free body diagram. 2. For ramp problem, usually people take the direction along ramp as x-axis, direction perpendicular to ramp as y-direction. But this time, you take horizontal direction from left to right as positive x axis, from bottom to top as positive y direction. find x-and y- components of normal force? 3. find x-and y-components of friction force
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- A girl is using a rope to pull a box that weighs 300 lb across a level surface with constant velocity.The rope makes an angle of 30 ̊ above the horizontal and the tension in the rope is 100 lb. What is thenormal force of the floor on the box?a. 50 lbb. 86 lbc. 140 lbd. 250 lbe. 300 lb3. Consider the situation shown where two boxes of mass m and m2 are placed on a plane tilted at angle 0. A spring with a spring constant of k is compressed by the boxes a distance s, and the whole assembly is at rest. Find the friction force of the plane on the lower box and the friction force between the boxes. Do you need to Ms 'me know the coefficient of static friction? If you believe you do it is µ. Present your answer in terms of the symbolic quantities given. Of course, present Free Body Diagrams.A large massive rock is in contact with the Earth. Draw a force diagram for the rock and the Earth. Which of the following statements is true? A. The contact force on the Earth due to the rock and the gravitational force on the Earth due to the rock are interaction partners. B. The gravitational force on the rock due to the Earth and the gravitational force on the Earth due to the rock y are interaction partners. C. The gravitational force on the Earth due to the rock and the contact force on the Earth due to the rock are interaction partners. D. The gravitational force on the rock due to the Earth and the contact force on the Earth due to the rock are interaction partners.
- A box is pulled at a constant speed, v, along a horizontal surface with a kinetic coefficient of friction less than 1. The person pulls with a constant horizontal force, F, on the box. The constant horizontal force the person pulls with: A. Has the same size as the weight of the box. B. Is greater than the weight of the box. C. Is less than the weight of the box. D. Is greater than the friction force.You are standing still on a bathroom scale. The scale shows your weight 140 lbs. How much is the support force? A. 140 x 9.8 m/s^2 B. ZERO C. 140N D. 140 lbsA person is trying to lift a box off the floor. The box has a mass of 55kg and the person can lift with a force of300N.a. Can the person lift the box?b. Find the normal force acting on the box.
- A block is at rest on inclined plane and is on the verge of slipping. Which of the following relationships between W and N is correct. (Vectors not drawn to scale) F; wooden block W a. Wsin(theta)=(mu)N b. W=(mu)N O c. Wcos(theta)=(mu)N d. Wsin(theta)=N1. Pushing a Bor Two workers are sliding a 300 kg crate across the floor. One worker pushes forward on the crate with a force of 380 N while the other pulls in the same direction with a force of 350 N using a rope connected to the crate. Both forces are horizontal, and the crate slides with a constant speed. What is the crate's coefficient of kinetic friction on the floor? 2. Fun Friction Problem A 4000 kg truck is parked on a 7.0 slope. Calculate the frictional force on the truck. 3. Rolling Friction The rolling resistance for steel on steel is a paltry = 0.002. How long would it take a 500,000 kg train to come to a stop if it was originally rolling at 10 m/s?4. A block of mass m = 5.9 kg is pulled up a 0 = 21° frictionless incline as in the figure below with a force of magnitude F = 37 N. (Hint: remember to measure all angles from +x axis.) F y Label the free body diagram below showing all the forces and the x and y axes. b. Write out 2 equations. The first summing all the x components and the second summing all the y components. c. Find the acceleration of the block.
- A block resting on a plane inclined at an angle 36o from the horizontal is being held in place by steel cables a, b, and c as shown in the figure below. The tension in cable b is 75.0 N. Note that cable a is parallel to the surface of the incline and that cable b is perfectly horizontal. a. determine the normal force N and the force due to gravity ??.b. What is the mass of the block in kilograms?A 125 kg box is pushed up a ramp with a force of 100N applied at a 30 deg below the horizontal. Coefficient of static friction is 0.9. 1. What is the normal force on the box? 2. What is the friction force on the box? 3. What is the largest friction force could be?3. Am=12.0 kg object is placed on a bathroom scale in an elevator. a. Draw a free body diagram of the object. Label the forces. Determine the apparent weight (the weight that would show in the scale) of the object if. b. The elevator is at rest. c. The elevator is rising at a constant velocity. d. The elevator is accelerating upward at 1.5 m/s/s. m e. The elevator is accelerating downward at 1.5 m/s/s. f. The elevator is accelerating downward at 10 m/s/s.