You are Here: Home >< Physics

# wheel and forces Watch

1. The problem statement, all variables and given/known data
Hi

It states this way:
A wheel of radius 0.5m rests on a level at a point C and makes contact with the edge E of a kerb of height 0.2m. A horizontal force of 240N, applied through the axle of the wheel at X, is required just to move the wheel over the kerb. Show that the weight of the wheel is 180N.

2. Relevant equations
Moment = Perpendicular force x distance

3. The attempt at a solution
I was thinking of taking moments but not even sure how to begin.
2. (Original post by aurao2003)
The problem statement, all variables and given/known data
Hi

It states this way:
A wheel of radius 0.5m rests on a level at a point C and makes contact with the edge E of a kerb of height 0.2m. A horizontal force of 240N, applied through the axle of the wheel at X, is required just to move the wheel over the kerb. Show that the weight of the wheel is 180N.

2. Relevant equations
Moment = Perpendicular force x distance

3. The attempt at a solution
I was thinking of taking moments but not even sure how to begin.
Yes, take moments about the point E.
For the sphere to just lift, the clockwise moments = anticlockwise moments.
Here's a diagram to help.
You need to work out the perpendicular distances EA and EB
It's just a bit of geometry and pythagoras.
I've probably given you too much help with this one!

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: November 30, 2010
Today on TSR

Find out how.

### Want £10K to start a business?

Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• Poll
Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.