Why does the box start to move instantly?

Why does the box start to move instantly?

– The box begins to move as the applied force is larger than the friction force d. When the box is not moving, the sum of the friction and applied force is zero, so the net force is zero. when the box is moving, the sum of the friction and applied force is greater than zero, so the net force is greater than zero.

Why is it often harder to get something to start to move than to keep it moving?

The maximum static friction force is: (fs)max = μs N where μs is the coefficient of static friction. Static friction is subtle because the static friction force is variable and depends on the external forces acting on an object. It is harder to move a stationary object than it is to keep a moving object in motion.

Why is there less friction on the box now that it is moving?

With most of the adhesion and abrasion being overcome to induce movement, the resistance to motion between the surfaces is reduced, and the surfaces are now moving under the influence of kinetic friction, which is much lower than static friction.

What is the relationship between force friction and speed?

There the frictional force is proportional to the velocity for small velocities. That proportionality breaks down when the velocity becomes larger. In particular, it breaks down (and the drag goes up more rapidly) when something called the Reynolds’ number becomes large.

Why surface area does not affect friction?

Larger surface area means more contact, which should mean more friction. But a larger surface area also means the surfaces are less compressed, which would reduce the the friction. This is easily demonstrated with weights and foam.

What force depends on force between surfaces?

Friction

Which force is termed as self adjusting force?

Static friction is recognised as a self-adjusting force because it wants the objects to remain at rest not move. Hence, if an external force is applied, the static friction force will be equal to the magnitude of the external force, until it surpasses the threshold of motion.

What factors affect the force of friction between surfaces?

The friction force depends on two factors:

• a) The materials that are in contact. The two materials and the nature of their surfaces.
• b) The force pushing the two surfaces together. Pushing the surfaces together causes the more of the asperities to come together and increases the surface area in contact with each other.