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# How do I resolve forces on a horizontal plane? Watch

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1. Two particles P and Q, of masses 5kg and 3kg respectively, are connected by a light inextensible string. Particle P is pulled by a horizontal force of magnitude 40N along a rough horizontal plane. The coefficient of friction between each particle and the plane is 0.2.

What's equation do I need to use to resolve the forces?
2. (Original post by ℓove)
Two particles P and Q, of masses 5kg and 3kg respectively, are connected by a light inextensible string. Particle P is pulled by a horizontal force of magnitude 40N along a rough horizontal plane. The coefficient of friction between each particle and the plane is 0.2.

What's equation do I need to use to resolve the forces?
Well first you must model the scenario because so far you seem like you have absolutely no idea what is happening or where to start.

Draw 2 particles connected by a string. P has a forward force of 40N. It also has tension as well as friction acting in the opposite direction.
3. (Original post by RDKGames)
Well first you must model the scenario because so far you seem like you have absolutely no idea what is happening or where to start.

Draw 2 particles connected by a string. P has a forward force of 40N. It also has tension as well as friction acting in the opposite direction.
Okay what do I do now?
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4. (Original post by ℓove)
Okay what do I do now?
Well you need to mark on the friction force on both particles since friction acts on both. Also mark on the tension, gravitational force, as well as the reaction force.

Then consider the particles individually and resolve horizontally. Now I'm unsure what the actual question is, but if the particles are moving then you can get an inequality for the tension.

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Updated: September 25, 2016
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