Friday
December 19, 2014

Homework Help: PHYSICS

Posted by MJ on Monday, June 4, 2007 at 7:07am.

The drawing shows a large cube (mass = 34 kg) being accelerated across a horizontal frictionless surface by a horizontal force P. A small cube (mass = 3.3 kg) is in contact with the front surface of the large cube and will slide downward unless P is sufficiently large. The coefficient of static friction between the cubes is 0.71. What is the smallest magnitude that P can have in order to keep the small cube from sliding downward?


As I understand it, the smaller cube does not touch the horizontal surface, and is being held above that surface by friction force appled at the interface between the cubes.

The weight of the small cube is m g. (m = 3.3 kg). The force that is applied to the big block is
P = (M + m) a, where a is the acceleration. (M = 34 kg) The force applied to the small bloack is m a. The friction force is m a u, where u is the static coefficient of friction between the blocks (0.71).

To avoid vertical slippage
m a u > m g.
a > g/u
P > (M + m) g/u

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

Physics - The drawing shows a large cube (mass = 48 kg) being accelerated across...
Physics - The drawing shows a large cube (mass = 25 kg) being accelerated across...
Physics - The drawing shows a large cube (mass = 27 kg) being accelerated ...
Physics - The diagram below shows a large cube of mass 25 kg being accelerated ...
Physics - The drawing shows a large cube (mass=42 kg) being accelerated across a...
Physics - The drawing shows a large cube (mass=42 kg) being accelerated across a...
physics - A small cube of mass m1= 2.0 kg slides down a circular and ...
physics - A small cube of mass m1= 1.0 kg slides down a circular and ...
Physics Classical Mechanics Help ASAP - A small cube of mass m1= 1.0 kg slides ...
classical mechanic - A small cube of mass m1= 1.0 kg slides down a circular and ...

Search
Members