# Roller Cart dynamics problem

1. Apr 4, 2013

### DynamicDude

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

Cam followers are 25mm and 32mm in diameter. Mass is 4kg. Determine the reaction forces on all of the cam rollers when cart accelerates to the right at 20 m/s^2

2. Relevant equations

3. The attempt at a solution
(4kg)(20m/s^2)(.05m)/(.018m) = 222 N on small roller to the right??? Is there an equal but opposite force on the large roller too?
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

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2. Apr 5, 2013

### haruspex

Where is the force applied that is causing the acceleration?

3. Apr 8, 2013

### DynamicDude

assume it is applied 25mm directly below the C.G. (inline with C.G./centered between small rollers)

4. Apr 12, 2013

### DynamicDude

Ribbit Ribbit Ribbit......

So I guess there is no one here who knows the answer!??

5. Apr 12, 2013

### haruspex

Sorry for the delay - for some reason my standard search didn't pick up your earlier reply.
You suggest (4kg)(20m/s^2)(.05m)/(.018m). I think it's only half that.
List all the forces you believe will operate and write down any equations relating them that you can think of.