Equations of motion for uniform acceleration

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Homework Help Overview

The discussion revolves around a physics problem involving the equations of motion for a packing crate sliding down a ramp under the influence of gravity and friction. The problem presents a scenario where the crate's mass, the ramp's length, and the height from which it slides are provided, alongside the frictional force acting against its motion.

Discussion Character

  • Exploratory, Conceptual clarification, Problem interpretation

Approaches and Questions Raised

  • Participants discuss various approaches to tackle the problem, including drawing diagrams to visualize forces, considering energy conservation, and resolving forces into components. Questions arise about how to account for gravity and friction on an inclined plane.

Discussion Status

The discussion is ongoing, with participants offering different methods to approach the problem, such as using energy conservation and work-energy principles. There is no explicit consensus yet, but several lines of reasoning are being explored.

Contextual Notes

Participants express uncertainty about how to begin solving the problem and seek guidance on the initial calculations needed. There is a mention of a specific gravitational constant and the need to consider forces acting on the crate.

geordieonline
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Homework Statement



Hi All,

The question That I am stuck on is:

A packing crate has a nass 100kg is allowed to slide down on a ramp until it hit the ground. The friction resistance to motion is 240N. The length of the ramp is 10 m and thehieght of the crate from the ground just before it started to slide is 6m. Calculate the speed of the crate just before it hits the ground

To be perfectly honest, I don't know where to start! What would you work out first, don't want the answer just help on how to tackle the question - what needs to be worked out first?

Homework Equations



g= 10N/Kg

I've found these equations while researching (I think they are relevant):

Speed = Distance / Time

Velocity = speed + Direction

Work = Force x Distance


The Attempt at a Solution



Don't know where to start

Any advice would be most welcome
 
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The first thing i would do with a question like this is draw a diagram and clearly label it, including all of the forces that are present
 
Cheers Dango

I Have a diagram, but don't know what or how to tackle the question?

Dont know how gravity / crate weight vs friction is worked out with an incline plane?

Would like some advice, direction as what to calculate first - I aint got a clue, have searched wikipedia etc and still don't understand stand:cry:
 
A problem like this is probable easier in terms of energy conservation
 
Do you know how to resolve a force into its horizontal and vertical parts ?

You also need this formula

acceleration = force/mass
 
I think it's way easier if you use work formula:
change in energy = force applied in that direction x distance

ignore everything else, and find the net force in the direction that object is moving
and only energy changing i kinetic energy
 
Work done by Friction + Work done by gravity = Final K.E. - Initial K.E.

<i hope this is right!>
now, u can work out the individual work done and find v.
 

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