Register to reply

Question about Kinetic Force

by pope17
Tags: force, friction, kinetic, physics, weight
Share this thread:
pope17
#1
Nov13-10, 06:02 PM
P: 1
1. The problem statement, all variables and given/known data

A box has a weight of 150N and is being pulled across a horizontal floor by a force that has a magnitude of 110N. The pulling force can point horizontally, or it can point above the horizontal at an angle (?). When the pulling force points horizontally, the kinetic frictional force acting on the box is twice as large as when the pulling force points at the angle (?).

2. Relevant equations

Find (?)

3. The attempt at a solution

I set up my equation to be 2(150)=150 - 110sin43.
...which is not right.
any help would be greatly appreciated :)
Phys.Org News Partner Science news on Phys.org
FIXD tells car drivers via smartphone what is wrong
Team pioneers strategy for creating new materials
Team defines new biodiversity metric
PhanthomJay
#2
Nov13-10, 06:41 PM
Sci Advisor
HW Helper
PF Gold
PhanthomJay's Avatar
P: 6,040
pope 17, welcome to Physics Forums!

How did you determine that the angle is 43 degrees, if your equation was set up incorrectly?

Re-wording the problem, note that when the pulling force acts at an angle , the kinetic friction force is 1/2 the kinetic friction force when the pulling force acts horizontally.


Register to reply

Related Discussions
Question about kinetic friction force? Classical Physics 2
Force with kinetic energy question Introductory Physics Homework 6
I need to find the coefficient of the kinetic force and the kinetic force? Introductory Physics Homework 1
Kinetic frictional force question Introductory Physics Homework 2
Another Question: Find the work done by the kinetic frictional force Introductory Physics Homework 1