COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 4, Problem 32QAP
To determine
The magnitude of the normal force exerted by the ramp compare to the weight of the block
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Students have asked these similar questions
15-7. Crates A and B weigh 100 lb and 50 lb, respectively.
If they start from rest, determine their speed when t = 5 s.
Also, find the force exerted by crate A on crate B during the
motion. The coefficient of kinetic friction between the
crates and the ground is µ = 0.25.
A
P = 50 lb
If P = 200 N, determine the friction developed between the 50-kg crate and the ground. The coefficient
of static friction between the crate and the ground is us= 0.3.
1) Two blocks of masses m, = 5kg and m,
2kg are connected by a rope. The coefficient of
%3!
static friction between m, and the surface is u, = 0.5, and the coefficient of kinetic friction
%3D
is = 0.4. Which of the the following statements is correct about the type and the
magnitude of the friction force acting on m, ? (Let g =10m/s)
%3D
mi
Select one:
a. Static, 20 Newtons
b. Kinetic, 20 Newtons
c. Static, 50 Newtons
d. Static, 25 Newtons
e. Kinetic, 50 Newtons
f. Static, 0
g. Kinetic, 0
h. Kinetic, 25 Newtons
Chapter 4 Solutions
COLLEGE PHYSICS
Ch. 4 - Prob. 1QAPCh. 4 - Prob. 2QAPCh. 4 - Prob. 3QAPCh. 4 - Prob. 4QAPCh. 4 - Prob. 5QAPCh. 4 - Prob. 6QAPCh. 4 - Prob. 7QAPCh. 4 - Prob. 8QAPCh. 4 - Prob. 9QAPCh. 4 - Prob. 10QAP
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- We know from studying friction forces that static friction increases with increasing normal force between the surfaces, which becomes important for vehicles traveling on icy or snowy roads that have coefficients of static friction much smaller than those of dry pavement. In particular, the greater the normal force on the drive wheels (those coupled to the engine), the better the traction. The horizontal position of the center of mass of a typical compact automobile is located 1.1 m toward the rear as measured from the front wheel axle. The wheelbase (distance from the front wheel axle to the rear wheel axle) is 2.7 m. Assume the car is stationary on level ground and has a weight of 12,000 N. Determine the total normal force on the two front tires and on the two rear tires. Which do you suppose are the drive wheels in this case?arrow_forward4-54. The spool has a mass of 200 kg and rests against the wall and on the floor. If the coefficient of static friction at B is (4)e = 0.3, the coefficient of kinetic friction is (He)B = 0.2, and the wall is smooth, determine the friction force developed at B when the vertical force applied to the cable is P= 80 N. 0.4 m 0.1 marrow_forward8–26. The refrigerator has a weight of 180 lb and rests on a tile floor for which u, = 0.25. If the man pushes horizontally on the refrigerator in the direction shown, determine the smallest magnitude of horizontal force needed to move it. Also, if the man has a weight of 150 lb, determine the smallest coefficient of friction between his shoes and the floor so that he does not slip. 4/8 -15 f- 3 ftarrow_forward
- A 10-kg weight is suspended by a rope from a ceiling. If a horizontal force of 5.80 kg is applied to the weight, the rope will make an angle with the vertical equal to:arrow_forward3-51. Determine the greatest force F that can be applied to the ring if each cable can support a maximum force of 800 lb. B -2 ft -3 ft- F 1 ft D 3 ft 6 ft Aft 2 ftarrow_forwardA box rests on a level table. Let W be the weight of the box, and N is the normal of the table on the box. In magnitude, W is opposite and ___ N, and the two forces ___ action-reaction pair. Group of answer choices equals, are not equals, are is greater than, are is greater than, are notarrow_forward
- 3-39. A "scale" is constructed with a 4-ft-long cord and the 10-lb block D. The cord is fixed to a pin at A and passes over two small pulleys. Determine the weight of the suspended block B if the system is in equilibrium when s=1.5 ftarrow_forward7) An object placed in the xy-plane has three forces acting on it: a force of 17.1 N along the x-axis acting at a point (2.6 m, 7.5 m); A force of 9.4 N along the negative y-axis acting at (-15.2 m, -4.9 m); and a force of 10.3 N in the negative x direction acting at (-7.6 m, 11.2 m). What is the net torque about the point (0.55 m, -0.55 m)?arrow_forwardA large box of mass 11.4 kg sits on a ramp that makes an angle of 30.1 degrees with the horizontal. The surface of the ramp is rough and the coefficients of static and kinetic friction are given as 0.56 and 0,38, respectively. We exert a force up the ramp (parallel to the ramp surface) so that the box does not move. Calculate the maximum and the minimum magnitude of the force we can exert so that the box does not move. Enter the difference between the maximum and the minimum force values here: Fmax-Fmin (in Newtons). On your paper, show all the forces on free-body diagrams, clearly show your work, your derivation and calculations. Make sure to include your physics-based reasoning.arrow_forward
- 2-49. If F1 300 N and 0 = 10°, determine the magnitude and direction, measured counterclockwise from the positive x' axis, of the resultant force acting on the bracket. y F2= 200 N F3 = 180 N 60° F1 13 12arrow_forwardThe two trees in the figure are 6.7 m apart. A back- packer is trying to lift his pack out of the reach of bears. (Figure 1) a) Calculate the magnitude of the force F that he must exert downward to hold a 20-kg backpack so that the rope sags at its midpoint by 1.7 m. b) Calculate the maanitude of the force F that he must exert downward to hold a 20-kg backpack so that the rope sags Figure at its midpoint by 0.13 m. Farrow_forwardWrite Newton's laws for a static system (1) EF, = mg sin 0 – µ̟n = 0 in component form. The gravity force has two components. (2) EF, = n - mg cos 0 = 0 Rearrange Equation (2) to get an n = mg cos e expression for the normal force n. Substitute the expression for n into EF, = mg sin 0 – µ̟mgcos 0 = 0 → tan 0 =µ, Equation (1) and solve for tan 0. Apply the inverse tangent function to tan 0 = 0.350 → 0 = tan 1 (0.350) = 19.3° get the answer. LEARN MORE REMARKS It's interesting that the final result depends only on the coefficient of static friction. Notice also how similar Equations (1) and (2) are to the equations developed in previous problems. Recognizing such patterns is key to solving problems successfully. QUESTION A larger static friction constant would result in a: (Select all that apply.) O larger component of normal force at the maximum angle. O larger component of gravitational force along the ramp at the maximum angle. smaller component of gravitational force along the ramp…arrow_forward
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