Centripetal And Centrifugal Force

For every object, the force is required to travel. The force acts differently depending types of motion. In the case of curvilinear motion, The two types of force come into the picture. That is the centrifugal force and centripetal force. Centripetal force is the force acting towards the center of the circular path. Whereas the centrifugal force acts in a direction pointing away from the center of the circle.

Centripetal And Centrifugal Force

What is Centripetal Force?

Centripetal force definition is given as “The component of force acting on an object in curvilinear motion which is directed toward the axis of rotation or center of curvature.” Centripetal force unit is Newton. The centripetal force direction is always perpendicular to the direction that the object is being displaced.

If an object accelerates according to the changes of velocity, then it can change either its speed or direction of motion. In simple terms, if any moving object in a circular path is constantly changing its direction means it is constantly accelerating. Using Newton’s second law of motion, if an object is traveling in a circular path, it is found that the centripetal force of an object moving in a circular path always acts towards the center of the circle.

Centripetal Force Formula

Centripetal Force Formula is given as the product of mass (in kg) and tangential velocity (in meters per second) squared, divided by the radius (in meters). Which implies that On doubling the tangential velocity, the centripetal force will be quadrupled. Mathematically it is written as:

\(F=ma_{c}=\frac{mv^{2}}{r}\)

Where,

  • F is the Centripetal force.
  • ac is the Centripetal acceleration.
  • m is the mass of the object.
  • v is the speed or velocity of the object.
  • r is the radius.

Centripetal Force Examples

The force that pulls or pushes an object toward the center of a circle as it travels, causing angular or circular motion is called a Centripetal Force. Some examples of Centripetal Force is given below.

  • Spinning a ball on a string or twirling a lasso: Here the centripetal force is provided by the force of tension on the rope pulls the object in toward the center.
  • Turning a car: Here the centripetal force is provided by the frictional force between the ground and the wheels.
  • Going through a loop on a roller coaster: The force is provided by the Normal Force as the seat or wall pushes you toward the center.
  • Planets orbiting around the Sun: Centripetal Force is provided by Gravity.

 

 

Centrifugal Force

If an object moving in a circle and experiences an outward force than this force is called the centrifugal force. However, the force also depends on the mass of the object, the distance from the center of the circle and also the speed of rotation. If the object has more mass, the force of the movement and the speed of the object will be greater. If the distance is far from the center of the circle the force of the movement will be more.

Centrifugal Force Definition

The Centrifugal Force is defined as “The apparent force, which is equal in magnitude and opposite in direction to the centripetal force, drawing a rotating object away from the center of rotation, caused by the inertia of the object.” Centrifugal force unit is Newton. The centrifugal force drives the object away from the center. It is a fictitious force.

Centrifugal Force Formula

Centrifugal Force Formula is given as the negative product of mass (in kg) and tangential velocity (in meters per second) squared, divided by the radius (in meters). Which implies that On doubling the tangential velocity, the centripetal force will be quadrupled. Mathematically it is written as:

\(F_{c}=-\frac{mv^{2}}{r}\)

Where,

  • Fc is the Centrifugal force
  • m is the mass of the object
  • v is the velocity or speed of the object.
  • r is the radius.

Centrifugal Force Examples

Centrifugal Force acts on every object moving in a circular path when viewed from a rotating frame of reference. Some examples of Centrifugal Force are given below.

  • Weight of an object at the poles and on the equator
  • A bike making a turn.
  • Vehicle driving around a curve
  • Equatorial railway

Centripetal Force Vs Centrifugal Force Difference

Check the table below to learn the detailed comparison between Centripetal and Centrifugal Force

Differences Between Centripetal And Centrifugal Force
Centrifugal Force
Centripetal Force
If an object moving in a circle and experiences an outward force than this force is called the centrifugal force If the object travels in a uniform speed in a circular path is called centripetal force.
The object has the direction along the center of the circle from center approaching the object The object has the direction along the center of the circle from the object approaching the center.
Mud flying of a tire is one example of the centrifugal force. A satellite orbiting a planet is an example of the centripetal force.

 

Centripetal Force and Centrifugal Force Important Questions

Q1: What is Centripetal force?
Ans: Centripetal force is defined as the force required to keep a body moving in a circular path and direct towards the center of a circle.

Q2: Give examples of Centripetal force.
Ans: Following are the examples of centripetal force:

  • The revolution of the moon around the earth.
  • The spinning of the top.
  • Rides in a roller coaster.

Q3: What is the formula of centrifugal force?
Ans: \(F_{c}=-\frac{mv^{2}}{r}\) Where,

  • Fc is the centrifugal force
  • m is the mass
  • v is the speed
  • r is the radius

Q4: What is the formula of centripetal force?
Ans: \(F=\frac{mv^{2}}{r}\) Where,

  • F is the centripetal force
  • m is the mass
  • v is the speed
  • r is the radius

Q5: Compare Centrifugal force and centripetal force.
Ans: Centrifugal force is equal in magnitude and opposite in direction to the centripetal force.

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Practise This Question

ABC is a right angled triangle in which AB=3 cm and BC=4 cm . And ABC=π2. The three charges +15, +12 and -20 e.s.u. are placed respectively on A, B and  C. The force acting on  B is