Physics Help Forum Friction

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 Mar 1st 2018, 07:50 PM #1 Junior Member   Join Date: Mar 2018 Posts: 1 Friction Help please! Confused as heck! Attached Thumbnails
Mar 2nd 2018, 02:59 AM   #2
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Location: Somerset, England
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 Originally Posted by lyssah Help please! Confused as heck!
So where are you with this one?

Have you made a start as they suggested and drawn the free body diagram and can you post it?

 Mar 2nd 2018, 06:39 AM #3 Senior Member   Join Date: Jun 2010 Location: NC Posts: 417 Crate Pushed Uphill Iyssah, Here's a similar example. Crate Pushed Uphill | THERMO Spoken Here! Any Help? TSH
Mar 6th 2018, 06:21 AM   #4
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 Originally Posted by lyssah Help please! Confused as heck!
Sometimes, with worded problems like this, it can be confusing simply because there's a lot of information and when you read through it, your brain goes "no thanks!". There's also a lot of forces in this one, so your force diagram might look really busy.

Therefore, a good way of starting problems like this is to get a fresh piece of paper and make your own free-body diagram. In fact, the question asks you to do this

So... have a go at these steps:

1. Draw the block and the slope (no arrows, data or anything else yet...)
2. Read through the text and if there's a mention of anything like a force (weight, tension, friction, etc.), then draw it on your diagram as an arrow.
3. Add any other force arrows you think might affect the block.

For part 3 above, you should consider the following:
i) weight
ii) friction force
iii) normal force (slope pushing up on the block)

remember that most forces act through a single point on an object called the "centre of mass". For a block problem, you can just pick the point in the middle of the block. Your force arrows then start from that point.

Hint: Your diagram should have four forces on it

Once you have your diagram, you can start calculating the force balance and solving the problem. Can you scan it and put it up here?

Last edited by benit13; Mar 6th 2018 at 06:24 AM.

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