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9 Problems on the Kinetic Frictions and Acceleration - Midterm Exam 2 | PH 111, Exams of Physics

University of Alabama - HuntsvillePhysics
Prof. Massimiliano Bonamente

Material Type: Exam; Professor: Bonamente; Class: GEN PHYSICS W/CALCULUS I; Subject: Physics; University: University of Alabama - Huntsville; Term: Summer 2007;

Typology: Exams

Pre 2010

Uploaded on 07/23/2009

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koofers-user-h80 🇺🇸

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PRACTICE PROBLEMS FOR MIDTERM 2 - PH111
1. Problem 5.50 of textbook
2. Problem 5.51 of textbook
3. Consider two blocks as in figure, mA=mB= 1 [kg]. The coefficient of kinetic
friction between the blocks and the surface is µK= 0.1. The pulley is frictionless, and the
cord massless. The angle of the incline is α= 20 degrees.
α
a
A
B
Find:
(a) The tension in the rope;
(b) The acceleration of the two boxes;
(c) Total work done by friction while sliding by 1 [m].
(d) Would the two boxes move to the right if µK= 0.5?
4. An object of mass m=2 [kg] is lowered at constant speed on a spring of constant
k= 200 [N m], from a height of H=1 [m]. You may approximate g=10 [m s−2] in order to
simplify the calculations. Find:
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Partial preview of the text

Download 9 Problems on the Kinetic Frictions and Acceleration - Midterm Exam 2 | PH 111 and more Exams Physics in PDF only on Docsity!

PRACTICE PROBLEMS FOR MIDTERM 2 - PH

  1. Problem 5.50 of textbook
  2. Problem 5.51 of textbook
  3. Consider two blocks as in figure, mA = mB = 1 [kg]. The coefficient of kinetic friction between the blocks and the surface is μK = 0.1. The pulley is frictionless, and the cord massless. The angle of the incline is α = 20 degrees.

α

a

A

B

Find: (a) The tension in the rope; (b) The acceleration of the two boxes; (c) Total work done by friction while sliding by 1 [m]. (d) Would the two boxes move to the right if μK = 0.5?

  1. An object of mass m=2 [kg] is lowered at constant speed on a spring of constant k = 200 [N m], from a height of H=1 [m]. You may approximate g=10 [m s−^2 ] in order to simplify the calculations. Find:

  H

(a) How much work is done by the force F applied to hold the object during the descent; (b) The box is released, at rest, atop the relaxed spring. What is the box’s speed when it has compressed the spring by x=20 [cm]?

  1. Two balls of mass m=1 [kg] have initial speeds of v 1 i=1 [m/s], v 2 i=0, and undergo a head-on collision.

v 1

m (^) m

(a) Find the velocity of the center of mass after the collisions. (b) Assume that the collision is elastic. Find the two ball’s velocity after the collision, and the velocity of the center of mass after collision.

  1. A box of mass m=1 [kg] is pushed at an angle α=45 degrees by a force F of magnitude 7 F =[N] along a surface of μK =0.1. Find:

F^ α

(a) The normal reaction of the surface, FN ; (b) The box’s acceleration; (c) The work W done by F during a displacement of 2 [m].

  1. Problem 10.
  2. Problem 10.
  3. Problem 10.