hello, friends welcome to the new post. In this post, we will have a detailed look at Difference Between Static and Kinetic Friction. The force of a component among the two plans or surfaces at some angle is called friction. It caused to resist the motion among these 2 surfaces and results in the deform and heating in results.
There are 2 main types of kinetic and static. Their primary distinction is that whereas kinetic friction happens when there is movement between the two bodies, friction happens when there isn’t.
Here we will cover different parameters related to these two friction. So let’s get started Difference Between Static and Kinetic Friction.
Difference Between Static and Kinetic Friction
What is Static Friction?
- The force applied at the body and body does not show any motion and resistance to change in a position called static friction.
- The static friction helps the body not to move in place. the static friction coefficient is denoted with us and has a larger value than is coefficient for kinetic friction.
- The cause of static friction generation is the rough surface of anybody that reduces the fact force to move the body. Such a factor is called asperities.
- To reduce the static friction there should be additional force is applied to the body.
- The practice example of static friction force applied on while to move on slop.
- The highest value of static friction is called limiting friction
- Its formula is FS=UsFN
What is Kinetic Friction?
- Kinetic friction exists for two moving objects that has a physical connection with each other,
- It is also called dynamic friction. its coefficient is denoted as Uk and its value is less than the static fraction value.
- Its equation is Fk=UkFn
- Its action is always opposite to moving object and does not depend on the surface which relies on
- the main operation of this friction is to decrease the speed of the moving body.
- A practical example of kinetic friction is mountain hiking
Kinetic Friction Definition?
- Kinetic friction is a force that operates between two surfaces that have a connection and have relative motion with each other.
- It is the force that resists the motion of an object which is already in motion state. Kinetic friction can exist between two surfaces that are sliding on each other are called sliding friction
- The quantity of kinetic friction depends on different factors like materials of surfaces that are in contact, speed of movement of objects and force applying the objects.
Static vs Kinetic Friction
| Static Friction | Kinetic Friction | |
|---|---|---|
| Definition | It Resists the initiation of motion | It causes resistance for objects in motion |
| Direction of force | It opposes the forced application | It Opposes motion direction |
| Magnitude of force | It is larger than the Kinetic friction | It is less than static friction |
| Relationship to force applied | It can be larger than the applied force | Its value is equal or less than the applied force |
| Conditions | it occurs when bodies are in rest | It causes objects in motion |
| Change in force | It increases with the increment in applied forces | It remains constant when objects are moving or have a moving state |
| Overcoming force | Must be overcome to start the motion of bodies | it should be overcome to maintain the motion of objects |
Examples of kinetic friction
Some examples of kinetic friction are explained here
- Rubbing your hands together: if you rub your hands together you can feel resistance which is kinetic friction. The friction force between your skin and palms produces heat energy
- Sliding a book across a table: If you slide a book onto the table you can feel force pushing back against the book motion that is kinetic friction. The resistance produced by the table surface roughness causes it harder to slide the book
- Brakes on a car: If you apply brakes on the car brake pads rub against rotors producing heat through kinetic friction. It slows the car through the conversion of kinetic energy into thermal energy
- Walking: When you are walking your foot pushes the ground and the ground pushes back against your feet with the force of kinetic friction it helps you to maintain balance and move ahead.
- Skidding on ice: If you are driving on icy roads and suddenly apply brakes cars tires lose traction and start skidding. As the automobile comes to a halt, the friction between the tires and the ice road lessens, and kinetic energy is transformed into heat energy.
Static Friction Examples
- Push book across a table: If you push a book that is in a rest state on the table the book would not move till you apply force on the book to overcome static friction. The book is held in place by the static friction that exists between it and the table.
- Opening the door: The force needed to open a door must be larger than the static friction force present between the door and the carpet or floor. The door will begin to move after static friction is eliminated.
- Trying to move a heavy-weight object: When you try to move to heave weight objects like a couch or refrigerator. You must apply enough force to overcome static friction in the object positioned on the ground. The thing will begin to move after static friction is overcome.
- Standing on the slope: The static friction which lies between your foot and the earth if you are standing on a slop avoids you from falling. To avoid sliding you needed to have high static friction force when slopes get steeper
- Starting a car: The force of static friction between the tires and the road must be overcome by the engine when you try to start an automobile in order for it to move. Once the automobile is going, kinetic friction exerts more force.
The direction of static friction
- The direction of static friction is opposite to the direction of force applied. It means that if we apply force to the body the force of static friction work in the opposite direction to stay the object in the rest position.
For this, if you try to lift high weight object from the ground force of static friction between the bodies and the ground will work - in opposite direction, so if you increase the force applied force of static friction will also increase
- The knowledge of static friction direction is important in physics since it helps to find the value of forces applying on bodies and give direction about their movement
- By getting the information about the direction and magnitude of forces applied we can suggest correct directions for the motion of objects in different conditions
FAQs
How is the Magnitude of Kinetic Friction Compared to the Maximum Static Friction?
The magnitude of kinetic friction is normally less than the maximum static friction. It is due to the force needed to retain the object in the motion state is normally less than the force needed to control the force of static friction and get the object to move in the first position. The maximum static friction is the quantity to overcome the force of static friction and start object movement while the force of kinetic friction is the force need to object in a motion state when it started.
Why is static friction greater than kinetic?
Because it requires more effort to start an item moving than it does to keep it going, static friction is larger than kinetic friction. The force needed to start an item moving and overcome the force of static friction is larger than the force needed to maintain the object’s constant speed, which is the force of kinetic friction. This is because the irregularities and interlocking between the surfaces in contact, which are what causes static friction, are considerably more difficult to break apart initially than they are to maintain motion once they have started.
Why is kinetic friction less than static?
Because it requires less force to maintain motion than it does to initiate it, kinetic friction is smaller than static friction. When an item is moving, the interlocking points between the surfaces in contact have already been broken down, making it easier for the surfaces to glide over one another. Since less force is required to keep things in a moving state that is less friction.
Is static friction always greater than kinetic friction?
It’s not always the case that kinetic friction is larger than static friction. The amount of force applied, the materials in contact, and additional variables like temperature and surface area all affect how much friction there is. The force of kinetic friction may in some circumstances be larger than the force of static friction. For example, the force of kinetic friction can be larger than the force of static friction if two surfaces come with less coefficient of static friction but static friction has a high coefficient of kinetic friction.
What factors affect the force of friction?
The objects have a connection quantity of force applied, surface areas in contact, temperature, and existence of any lubes between surfaces all have an effect on the force of friction Understanding these variables is crucial for forecasting how items will move and interact with one another. They can affect both the static and kinetic friction forces.
That is a detailed post about the difference between static friction and kinetic friction if you still have any further queries ask in the comments. Thanks for reading. Have a nice day.
