Particles on Level Ground Moving at Constant Velocity

If a particle is moving at constant velocity then there is no net force acting in any direction.

We can resolve vertically and horizontally, forming simultaneous equation to find the unknown forces.


A heavy crate, of mass 200 kg, is pulled along a rough horizontal surface at a constant speed by a

rope. The rope is at an angle of 30° to the horizontal. The tension in the rope is T newtons.

The coefficient of friction between the crate and the surface is 0.6. Model the crate as a particle.

We draw a diagram showing all the forces acting.

We can now resolve vertically to obtain


and horizontally to obtain



Then from (2)

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