Use Coupon: CART20 and get 20% off on all online Study Material

Total Price: R

There are no items in this cart.
Continue Shopping
Get instant 20% OFF on Online Material.
coupon code: MOB20 | View Course list

  • Kinematics & Rotational Motion
  • View Details
Get extra R 150 off


Which force balance the weight of object, when it is tied at one end of string and rotated horizontally exactly in a plane parallel to ground?

6 years ago


Answers : (2)


Dear Sachin,

Generally in the cases of motion of the string in circular motion with one end of tied to an object, the object experiences the forces in equilibrium.

1. Force due to the rotational motion .ie. centripetal force--- Fr=mv2/r,

2. Force due to gravity --- F = mg,

3. Tension in the string T.

Now when we are rotating at low speeds where Fr and F are comparable then the object will rotate making angle θ with the vertical such that the resultant force FT = √[ Fr2 + F2] is balanced by the tension in the string T.

We also have tan θ = Fr /F

So we spin the object such that its contribution to the square sum is more than the force due to gravity then the object becomes horizontal thus there is no necesscity to balance the gravitational force as it is negligible.

So when Fr is very large then θ = 900

Please feel free to post as many doubts on our discussion forum as you can. If you find any question
Difficult to understand - post it here and we will get you the answer and detailed solution very quickly. We
are all IITians and here to help you in your IIT JEE preparation.

All the best !!!



Askiitians Experts

Adapa Bharath


6 years ago

Dear Sachin

Resultant of Weight and centrifugal force is balance by tension in spring

when rotation speed is very high then

centrifugal force is very large compair to weight of the mass. angle made by string in this case with the vertical is almost 90 degree(not equal to 90).

string not rotated horizontly but with a very small angle with horizontal.

if sting is not completly horizontal then its tension must have vertical component also which balance the weight of the mas






6 years ago

Post Your Answer

Other Related Questions on General Physics

How to take the component of final momentum when a ball strikes surface at an angle 60 and reflects at same speed and same angle with surface?
After collision take horizontal and vertical components as vcos60 and vsin60 in x- and -y direction respectively. And do the same for initial velocity. And apply momentum conservation in x...
Vikas TU 14 days ago
In many books there is written vcos60(-i) and vcos60(-j) for x-plane and y- plane respectively............
Manish Kumar 14 days ago
A body, having kinetic energy k, moving on a rough horizontal surface, is stopped in a distance x. The force of friction exerted on the body is (1) k x (2) k x (3) k x (4) kx
You no longer have to wait desperately for someone to help resolve your doubt. You can chat with IITians live, 24/7 (even at 3AM!) and get your doubt resolved instantly. Try the HashLearn...
Ankit 3 months ago
From Work Energy Theorem, Wtotal = change in kinetic enrgy -f*x = 0 – k f = k/x is the required friction force.
Vikas TU 3 months ago
Two persons holding rope of negligible wt. at its horizontal ends . A 15 kg weight is attached to mid of rape which no longer remain horizontal. Minium tension required to straighten rope...
At the mid of the rope the weight will be makingof 45 degree agle with x and y axis both. Therefore components the Tension force as Tcos45 and Tsin45 in x and y direcn. respectively. thus...
Vikas TU 2 months ago
What books can you suggest for clarity in thermal physics
Halliday & Resnic, Sears & Zemansky or Nelkon & Parkar.
Neeti one year ago
Aditya Raj one year ago
WHAT IS UNDER DAMPED OSCILLATIONS..................................?
Dear Gangadhar, Under damped oscillations when the amplitude is rapidly decreases and becomes to the rest position.
SAI SARDAR 7 months ago
The three resulting cases for the damped oscillator are ... When a damped oscillator is underdamped , it approaches zero faster than in the case of critical damped
Prabhakar ch 7 months ago
what is the magnetism?
A magnetic field is generated when electric charge carriers such as electrons move through space or within an electrical conductor. The geometric shapes of the magnetic flux lines produced...
KARTHIK one year ago
Magnetism is a class of physical phenomena that are mediated by magnetic fields. Electric currents and the magnetic moments of elementary particles give rise to a magnetic field, which acts ...
SHANMUKESHWAR one year ago
J Magnetism is one aspect of the combined electromagnetic force. It refers to physical phenomena arising from the force caused by magnets, objects that produce fields that attract or repel...
KARTHIK one year ago
View all Questions »

  • Complete JEE Main/Advanced Course and Test Series
  • OFFERED PRICE: R 15,000
  • View Details
Get extra R 3,750 off

  • Kinematics & Rotational Motion
  • View Details

Get extra R 150 off

More Questions On General Physics

Ask Experts

Have any Question? Ask Experts

Post Question

Answer ‘n’ Earn
Attractive Gift
To Win!!!
Click Here for details