What causes stick-slip?

What causes stick-slip?

The generally agreed upon view is that stick-slip behavior results from common phonon modes (at the interface between the substrate and the slider) that are pinned in an undulating potential well landscape that un-pin (slip) and pin (stick) primarily influenced by thermal fluctuations.

What three conditions are needed for stick-slip motion?

The three conditions for stick-slip motion are: (1) two objects that are touching each other where at least one of the objects can move, (2) a force, or forces, that will cause the movement, (3) friction strong enough to temporarily keep the moving from starting.

How do you prevent stick slips?

How to Avoid Stick-Slip in Your Seals

  1. Material hardness, elasticity, friction, and chemical properties: ensure compatibility between surfaces.
  2. Surface roughness: ensure shafts or cylinders are neither too smooth nor too rough.
  3. Fluid lubricity: change fluid if necessary, or use oil treatments or friction reducers.

How do you stop a stick-slip drilling?

The conventional method of mitigating stick-slip is increasing RPM and/or decreasing weight on bit (WOB), which is inefficient and can induce bit-damaging lateral vibration. By using the SoftSpeed II system, higher WOB can be achieved at a given RPM before stick-slip foundering occurs (Fig. 1).

What is stick slip motion?

Stick slip refers to the fast movement that occurs between two sides of a fault when the two sides of the fault become unstuck. The rock becomes distorted, or bent, but holds its position until the earthquake occurs. When the rock snaps back into an unstrained position it is called elastic rebound.

What is a seismic slip?

Slip is the relative displacement of formerly adjacent points on opposite sides of a fault, measured on the fault surface.

What is sticking friction?

Sticking friction is when the work surface adheres to the surface of the tool rather than slides against it; it occurs when the friction stress is greater than the shear flow stress of the metal.

What effect would friction have on a rolling football?

Friction helps the player run but it also slows the player down. When a player is running with cleats on it is rolling friction because it is pointed. when a football is in the air it is fluid friction because there are gasses in the air.

What are 3 ways friction can be reduced?

Methods for decreasing friction:

  • Make the surfaces smoother. Rough surfaces produce more friction and smooth surfaces reduce friction.
  • Lubrication is another way to make a surface smoother. ...
  • Make the object more streamlined. ...
  • Reduce the forces acting on the surfaces. ...
  • Reduce the contact between the surfaces.

Why does a ball eventually stop rolling?

"When you roll a ball on the ground, the electrons in the atoms on the surface of the ground push against the electrons in the atoms on the surface of your ball that is touching the ground. A rolling ball stops because the surface on which it rolls resists its motion.

What causes the rolling ball to stop when there is no one to push it?

When you roll a ball on the ground, the electrons in the atoms on the surface of the ground push against the electrons in the atoms on the surface of your ball that is touching the ground. A rolling ball stops because the surface on which it rolls resists its motion. A rolling ball stops because of friction.

Is force necessary to keep the ball rolling Why?

According to Newton's first law, the ball should continue to roll, since there is zero friction. The answer lies in another type of friction, called rolling friction. Rolling friction occurs because the objects in contact are not perfectly rigid.

How can we make it change its direction?

If an object changes direction, it is accelerating. Newton's second law says that if you apply a force to an object, the direction in which the object accelerates is the same as the direction of the force. You can change the direction of an object without changing its speed.

How can you tell if an object is moving?

An object is in motion when its distance from another object is changing. Whether an object is moving or not depends on your point of view. ... An object is in motion if it changes position relative to a reference point. You assume that the reference point is stationary, or not moving.

What if the boy and the girl pull the heavy crate at the same time?

Answer Expert Verified Yes, the object will move. The object will move to the direction of the greater force.

What makes an object stay in place?

An object will stay in place until a force sets it in motion. The pull of gravity is a force that might set an object (or a skier) in motion. ... The force you exert with your legs or arms can set a ball in motion. An object will continue to move until a force slows or stops it.

Is throw push or pull?

A force is a push or a pull. ... When you throw a ball, the force of your throw moves it forwards, the force of gravity pulls it down and the force of air resistance slows it down.

When you push or pull something you are creating?

Force is a push or a pull of an object that causes the object to speed up, slow down, or stay in one place. In other words, a force is what causes an object to move. Friction and gravity are two types of forces that influence how an object moves.

What is required to cause acceleration?

The acceleration of an object depends directly upon the net force acting upon the object, and inversely upon the mass of the object. As the force acting upon an object is increased, the acceleration of the object is increased. As the mass of an object is increased, the acceleration of the object is decreased.

Why do you get pushed against the door if the car makes a sudden turn?

Inertia. Your body, like all mass, tries to stay where it is, according to Newton's first law. If the car turns right, your body tries to stay where it was, which is on the left. Same reason when the car accelerates forwards, you are pushed back into your seat.

Is there acceleration when you push the box Why?

yes there is acceleration when you push the box because the box is changed its velocity from the initial to final point and there is the time taken to push the box and you can find its velocity by the formula of a = v- u / t.

Why is force equal to mass times acceleration?

Newton's second law is often stated as F=ma, which means the force (F) acting on an object is equal to the mass (m) of an object times its acceleration (a). This means the more mass an object has, the more force you need to accelerate it. And the greater the force, the greater the object's acceleration.

Why is it easier to push an empty cart than a cart full of groceries?

An empty grocery cart is easier to move because there is less mass in an empty cart compared to a full cart. ... Something with more mass will need a greater force to move it than something with less mass.

What does F MA mean?

F = ma

Is force equal to mass?

The net force on an object is equal to the mass of the object multiplied by the acceleration of the object. ... Force equals mass times acceleration. Force is measured in Newtons, N. Mass is measured in kilograms, kg.

Which object will fall first?

People often believe that the heavier ball will fall more quickly. They think that gravity acts more on a heavier object thus pulling it down faster. In fact, gravity works independently of mass. This means that all objects should fall at the same rate.

How does mass affect speed?

Mass doesn't affect speed directly. It determines how quickly an object can change speed (accelerate) under the action of a given force. Lighter objects need less time to change speed by a given amount under a given force.