A student applies a 100 N force at an angle 30° below the horizontal to a block causing the block to move at a constant speed along a level ground. Which statement regarding the kinetic friction on the block is most accurate? 100 N 30 The kinetic friction force is negligible and can be rounded to 0 N. The kinetic friction force is equal to 100 N. The kinetic friction force is greater than 100 N. The kinetic friction force i less than 100 N.

A student applies a 100 N force at an angle 30° below the horizontal to a block causing the block to move at a constant speed along a level ground. Which statement regarding the kinetic friction on the block is most accurate? 100 N 30 The kinetic friction force is negligible and can be rounded to 0 N. The kinetic friction force is equal to 100 N. The kinetic friction force is greater than 100 N. The kinetic friction force i less than 100 N.

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter5: Newton's Laws Of Motion

Section: Chapter Questions

Problem 40PQ: A sleigh is being pulled horizontally by a train of horses at a constant speed of 8.05 m/s. The...

See similar textbooks

Similar questions

A sleigh is being pulled horizontally by a train of horses at a constant speed of 8.05 m/s. The magnitude of the normal force exerted by the snow-covered ground on the sleigh is 6.37 103 N. a. If the coefficient of kinetic friction between the sleigh and the ground is 0.23, what is the magnitude of the kinetic friction force experienced by the sleigh? b. If the only other horizontal force exerted on the sleigh is due to the horses pulling the sleigh, what must be the magnitude of this force?
If a single constant force acts on an object that moves on a straight line, the objects velocity is a linear function of time. The equation v = vi + at gives its velocity v as a function of time, where a is its constant acceleration. What if velocity is instead a linear function of position? Assume that as a particular object moves through a resistive medium, its speed decreases as described by the equation v = vi kx, where k is a constant coefficient and x is the position of the object. Find the law describing the total force acting on this object.
Why is the following situation impossible? A 1.30-kg toaster is not plugged in. The coefficient of static friction between the toaster and a horizontal countertop is 0.350. To make the toaster start moving, you carelessly pull on its electric cord. Unfortunately, the cord has become frayed from your previous similar actions and will break if the tension in the cord exceeds 4.00 N. By pulling on the cord at a particular angle, you successfully start the toaster moving without breaking the cord.
Give reasons for the answers to each of the following questions: (a) Clan a normal force be horizontal? (b) Can a normal force be directed vertically downward? (c) Consider a tennis ball in contact with a stationary floor and with nothing else. Can the normal force be different in magnitude from the gravitational force exerted on the ball? (d) Can the force exerted by the floor on the hall be different in magnitude from the force the ball exerts on the floor?
Calculate the normal force on a 15.0 kg block in the following circumstances: (a) The block is resting on a level surface. (b) The block is resting on a surface tilted up at a 30.0 angle with respect to the horizontal. (c) The block is resting on the floor of an elevator that is accelerating upwards at 3.00 m./s2. (d) The block is on a level surface and a force of 125 N is exerted on it at an angle of 30.0 above the horizontal. (Sec Section 1.5.)
A nurse pushes a cart by exerting a force on the handle at a downward angle 35.0° below the horizontal. The loaded cart has a mass of 28.0 kg, and the force of friction is 60.0 N. (a) Draw a free-body diagram for the system of interest. (b) What force must the nurse exert to move at a constant velocity?
A woman exerts a horizontal force of 119 N on a box with a mass of 39.2 kg. If the box doesn't move, what's the magnitude of the static friction force (in N)? What is the minimum possible value of the coefficient of static friction between the box and the floor? (Assume the box remains stationary.)
A stockroom worker pushes a box with mass 13.5 kg on a horizontal surface with a constant speed of 3.00 m/s . The coefficients of kinetic and static friction between the box and the surface are 0.280 and 0.440, respectively. What horizontal force must the worker apply to maintain the motion of the box? (Express your answer in newtons. Assume that +x direction coincides with the direction of velocity.) If the worker stops pushing, what will be the acceleration of the box? (Express your answer in meters per second squared. Assume that +x direction coincides with the direction of velocity.)
After Successfully summiting a mountain, 72.0 kg climber is standing on a slope of angle 28 degrees, The frictional coefficients between her and the mountain slope are us=0.770, uk=0.280. a) At first, the climber does not exert a push on the ground to get herself moving, and therefore she remains stationary. What is the force of friction that she experiences in this situation? b) Then, the climber pushes off down the slope, with sufficient force to overcome static friction. What is the magnitude of that force? c) Once the climber has done the initial push off, she is no longer pushing, but begins sliding down the slope under her own weight. Draw a free body diagram for that situation. d) Find the climber's weight, the normal force, and the force of friction she experiences while moving
After Successfully summiting a mountain, 72.0 kg climber is standing on a slope of angle 28 degrees, The frictional coefficients between her and the mountain slope are us=0.770, uk=0.280. a) At first, the climber does not exert a push on the ground to get herself moving, and therefore she remains stationary. What is the force of friction that she experiences in this situation? b) Then, the climber pushes off down the slope, with sufficient force to overcome static friction. What is the magnitude of that force? c) Once the climber has done the initial push off, she is no longer pushing, but begins sliding down the slope under her own weight. Draw a free body diagram for that situation. d) Find the climber's weight, the normal force, and the force of friction she experiences while moving (PLEASE ONLY SOLVE FOR SUB PART D)
A 24 kg box is being pulled by a horizontal rope along a floor at aconstant speed (v = 1.0m/s). There is friction between the floor and the box with k = 0.40.a. The formula for tension in the rope is given by:a) T = μk gcosθb) T = Fnsinθc) T = μk mgd) none of these b. What is the magnitude of the tension?
A 2.5 kg block is placed on a rough plane inclined 40° with the horizontal. Coefficient of static friction andkinetic friction are 0.41 and 0.32, respectively. (a) What force applied parallel to the plane is needed to keepthe block in impending motion down the plane? Should this force be applied up or down the plane? (b)What force applied parallel to the plane is needed to keep the block moving down the plane with constantspeed? Should this force be applied parallel up or down the plane?