Prelab Questions 1. A box of mass m is dragged across a floor by a 50.0 N force, parallel to the floor. The box is accelerating at a rate of 3.00 m/s². https://www.finnsci.com/coefficient-of-friction/Document/?contentid-1a739f51-31b6-40u5-9122-c111fceb9210 6/23/2021 Coefficient of Friction a Draw a free-body diagram of the box assuming the floor is frictionless. b. Calculate the mass m of the box. 2. The same box now encounters a rough surface and moves with a constant velocity. a. Draw a free-body diagram of the box, and identify the force opposing the motion. b. Determine the coefficient of friction between the box and the surface. 3. The same box is then pulled over an especially rough surface and comes to a stop. The pulling force is still applied and the box does not move a Draw a free-body diagram of the box, and identify the force opposing the motion. b. The applied pulling force is increased to 70.0 N. The box remains stationary. Determine the coefficient of friction between the box and the floor. c The applied pulling force is steadily increased. Just before the box moves forward, the force is recorded to be 144.0 N. Determine the maximum coefficient of friction between the box and the surface. 4. The same box is being pulled by a force, F, at an angle, 0, above the horizontal, across a rough surface at a constant velocity. a. Draw a free-body diagram of the box. b. Identify the forces acting on the box in the a- and y-axes. c Will the frictional force increase or decrease as 0 is increased from 0° to 45°? Explain your reasoning. 5. Considering your answers to Prelab Questions 2, 3 and 4, and the p als, write a procedure for how you would determine the coefficient of kinetic (sliding) friction and the coefficient of static friction. Be sure to define the conditions of the system in your procedure. 13/15
Prelab Questions 1. A box of mass m is dragged across a floor by a 50.0 N force, parallel to the floor. The box is accelerating at a rate of 3.00 m/s². https://www.finnsci.com/coefficient-of-friction/Document/?contentid-1a739f51-31b6-40u5-9122-c111fceb9210 6/23/2021 Coefficient of Friction a Draw a free-body diagram of the box assuming the floor is frictionless. b. Calculate the mass m of the box. 2. The same box now encounters a rough surface and moves with a constant velocity. a. Draw a free-body diagram of the box, and identify the force opposing the motion. b. Determine the coefficient of friction between the box and the surface. 3. The same box is then pulled over an especially rough surface and comes to a stop. The pulling force is still applied and the box does not move a Draw a free-body diagram of the box, and identify the force opposing the motion. b. The applied pulling force is increased to 70.0 N. The box remains stationary. Determine the coefficient of friction between the box and the floor. c The applied pulling force is steadily increased. Just before the box moves forward, the force is recorded to be 144.0 N. Determine the maximum coefficient of friction between the box and the surface. 4. The same box is being pulled by a force, F, at an angle, 0, above the horizontal, across a rough surface at a constant velocity. a. Draw a free-body diagram of the box. b. Identify the forces acting on the box in the a- and y-axes. c Will the frictional force increase or decrease as 0 is increased from 0° to 45°? Explain your reasoning. 5. Considering your answers to Prelab Questions 2, 3 and 4, and the p als, write a procedure for how you would determine the coefficient of kinetic (sliding) friction and the coefficient of static friction. Be sure to define the conditions of the system in your procedure. 13/15
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Chapter1: Units, Trigonometry. And Vectors
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Transcribed Image Text:Prelab Questions
1. A box of mass m is dragged across a floor by a 50.0 N force, parallel to the floor. The box is accelerating at a
rate of 3.00 m/s².
https://www.flinnsci.com/coefficient-of-friction/Document/?contentid-1a739f51-31b8-40c5-9122-c111fceb921d
6/23/2021
Coefficient of Friction
a Draw a free-body diagram of the box assuming the floor is frictionless.
b. Calculate the mass m of the box.
2. The same box now encounters a rough surface and moves with a constant velocity.
a. Draw a free-body diagram of the box, and identify the force opposing the motion.
b. Determine the coefficient of friction between the box and the surface.
3. The same box is then pulled over an especially rough surface and comes to a stop. The pulling force is still
applied and the box does not move.
a. Draw a free-body diagram of the box, and identify the force opposing the motion.
b. The applied pulling force is increased to 70.0 N. The box remains stationary. Determine the coefficient of
friction between the box and the floor.
c The applied pulling force is steadily increased. Just before the box moves forward, the force is recorded to be
144.0 N. Determine the maximum coefficient of friction between the box and the surface.
4. The same box is being pulled by a force, F, at an angle, 0, above the horizontal, across a rough surface at a
constant velocity.
a. Draw a free-body diagram of the box.
b. Identify the forces acting on the box in the a- and y-axes.
c. Will the frictional force increase or decrease as 0 is increased from 0° to 45°? Explain your reasoning.
5. Considering your answers to Prelab Questions 2, 3 and 4, and the provided materials, write a procedure for how
you would determine the coefficient of kinetic (sliding) friction and the coefficient of static friction. Be sure to
define the conditions of the system in your procedure.
13/15
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