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)