Centripetal force Free essay! Download now
Home > A Level > Physics > Centripetal force

##
Centripetal force

**You can download this essay for free. All you need to do is register and submit at least one of your essays to us.**

**Or you can purchase this essay for just $2 instantly without registering**

**
Downloads to date:
N/A
| Words: 438 | Submitted: 07-Apr-2011**

**Spelling accuracy:
98.2% | Number of pages: 2 | Filetype: Word .doc
**

**This is what the first 2 pages of the essay look like**

### Description

*Centripetal force*### Preview

Title: Centripetal force

Objective

To measure the centripetal force for whirling a mass round a horizontal circle and compare the result with the theoretical value F= m?²r.

Apparatus

Rubber, glass tube about 15 cm long , weights 0.6 kg, 1.5 m of cotton string, meter rule, stop-watch, triple beam balance

Theory

When a mass m attached to a string is whirled round a horizontal circle of radius r, the centripetal force for maintaining the centripetal force for maintain the circular motion is given by F= m?²r, where ? is the angular velocity of the circular motion. This force is provided by the tension of the string. The formula can also be as expressed in terms of the velocity v of the mass, where ?=v / r.

Substituting ?=v / r into the formula for F,

F= m v²/r

However, the string was not horizontal as the rubber bung moved around. In fact, the bung moves in circle of radius r = L sin ? (Fig. A6.3). the tension T thus provides both the centripetal force and a force to support the weight of the bung. But resolving T into its horizontal and vertical components, show that T = m?²L regardless the angle ?.

The tension T in the string is provided by the weight of screw nuts (Mg). Therefore

T = Mg

As there is no vertical motion, the vertical component of tension (T) is balanced by the weight of the rubber bung (mg):

T cos?= mg (1)

The horizontal component of the tension provides the net centripetal forces:

T sin?= m?²r (2)

Substituting r = L sin? into equation (2), we can find the tension(T) in the string:

T sin?= m?²( L sin?)

T = m?²L

Method

1. One end of a string (~1.5 m ) was attached to a rubber bung. A length of say 0.6m of the string from the rubber bung to the glass tube was measured. This length l of the string was marked with the color pen. The free end was passed through a glass tube and then it was attached to some weights (~ 10 times the mass the ...

## Download this essay in full now!

### Just upload at one of your essays to our database and instantly download your selection! Registration takes seconds

## Comments and reviews

Reviews are written by members who have downloaded the essay

**No comments yet. If you download the essay you can review it afterwards.**