The Student Room Group

Is the reaction force in M1 always against the weight of the particle?

Say we have a particle with mass of 5KG in equilibrium that hangs vertically. A force of 200N is applied upwards and now is accelerating upwards. Does the reaction force go upwards due to the weight or does it go downwards due force and acceleration? Thanks guys
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Original post by watchmen98
Say we have a particle with mass of 5KG in equilibrium that hangs vertically. A force of 200N is applied upwards and now is accelerating upwards. Does the reaction force go upwards due to the weight or does it go downwards due force and acceleration? Thanks guys


there is no reaction if there is something hanging freely

there is normal reaction if an object is in contact with a surface

the normal reaction is always at right angles to the contact surface


there is tangential reaction (friction) if the surface is rough and there is motion or potential motion.

Tangential reaction (friction) always acts "against the direction of motion or potential motion"
If the object is suspended and the connecting string is taut, then there is tension. Do take note. Peace.

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