Static and dynamic friction

[doubledouble]

If the force I need to apply to a block before it starts moving is 10N, and the same force of 10N is continually applied thereafter, will the block accelerate or travel at constant speed (taking into consideration the presence of static and dynamic forces of friction) and why?

 

[Kurdt]

What do you think will happen?

 

[m2003]

The block will accelerate initially and then travel at a constant speed once it starts moving. This is due to the presence of both static and dynamic forces of friction.

Static friction is the force that must be overcome to initiate motion between two surfaces in contact. In this case, the force of 10N is enough to overcome the static friction and cause the block to start moving.

Once the block is in motion, it experiences dynamic friction, which is the force that opposes the motion of the block. This force will act in the opposite direction of the motion and will decrease the acceleration of the block. However, since the force of 10N is continually applied, the block will continue to experience a net force in the direction of motion and will therefore continue to accelerate.

Eventually, the block will reach a constant speed where the force of 10N is equal to the dynamic friction force. At this point, the block will travel at a constant speed since there is no longer a net force acting on it.

In summary, the block will initially accelerate due to the force being greater than the static friction, but will eventually travel at a constant speed due to the presence of dynamic friction. This is a result of the balance between the applied force and the forces of friction acting on the block.