Go Back   Physics Help Forum > High School and Pre-University Physics Help > Kinematics and Dynamics

Kinematics and Dynamics Kinematics and Dynamics Physics Help Forum

LinkBack Thread Tools Display Modes
Old May 6th 2013, 08:39 PM   #1
Junior Member
Join Date: May 2013
Posts: 1
Need Help with this Friction Problem


My colleague and I are having problems with this question. We are in contentions with option B and D.

Option B

Since the cart is being pushed, the wheels rotate in an anticlockwise direction and thus the friction should be opposite to the wheel's rotation. However, when a force is not applied, the cart slows down and thus friction should be to the right.

Option D

Since the cart is being pushed and no driving force exerted by the wheel, the friction is similar to that of a box sliding across a floor. The wheels help to reduce friction in this case.

It would be great to hear your views.

jeevankasin is offline   Reply With Quote
Old May 7th 2013, 01:41 PM   #2
Physics Team
ChipB's Avatar
Join Date: Jun 2010
Location: Morristown, NJ USA
Posts: 2,341
Since you have posted only a portion of the problem it's difficult to understand what's going on. However, regarding a rolling wheel on a floor - consider that if friction = 0 the wheel would not rotate, but would just slide (like a car on ice). So if the wheel is rotating there must be friction between the floor and the wheel that causes it to rotate, and the direction of this force on the wheel is in the direction of rotation. The friction force must be great enough to overcome the rotational inertia of the wheel and any friction in the bearings of the wheel.
ChipB is offline   Reply With Quote

  Physics Help Forum > High School and Pre-University Physics Help > Kinematics and Dynamics

friction, problem

Thread Tools
Display Modes

Similar Physics Forum Discussions
Thread Thread Starter Forum Replies Last Post
Friction Problem christineluhan Waves and Sound 1 Oct 8th 2014 12:16 AM
problem about friction panda Kinematics and Dynamics 0 Feb 1st 2014 04:42 AM
Friction problem JoanF Kinematics and Dynamics 8 Dec 29th 2009 12:01 PM
Friction Problem chrissn13 Kinematics and Dynamics 1 Feb 12th 2009 12:56 AM
Friction problem Morgan82 Kinematics and Dynamics 2 Jan 8th 2009 02:28 AM

Facebook Twitter Google+ RSS Feed