• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

What are the physical quantities that affect the value of centripetal force when a body in circular motion? What is the force exerted on the object when the object is doing a horizontal circular motion?

Extracts from this document...


Physical Science Experiment Report

Centripetal Force

Name_____Lee Lai Shan______


Problem statement:

What are the physical quantities that affect the value of centripetal force when a body in circular motion?

What is the force exerted on the object when the object is doing a horizontal circular motion?


To determine the relationship between the angular velocity of a body in circular motion ,the centripetal force F necessary to maintain a constant angular velocity ,the mass m of the body and the radius R of the circular path.

Experimental design:


1 Rubber bund , 1 glass tube about 15 cm long , screw nuts with hook, 1.5 m of nylon string , small paper marker, metre rule ,stop-watch

ii)Description of Design:

        The rubber stopper that will be swinging around in a circle for this lab travels a distance equal to the circumference of a circle. Because the rubber stopper will be traveling more than once around the circle, the total distance will be equal to the number or revolutions times the circumference.

...read more.


image04.png50 revolutions of the bung is timed by a partner.The angular velocity is calculated.The experiment is repeated using different lengths L of the string.The results are tabulated.

Data and Data Analysis

Tabulate the results as follows:

        Mass of rubber bung m         =      0.02609   ±    0.00001        kg

        Mass of screw nut M         =        0.10135  ±  0.00001      kg

⇒ Tension in string T = Mg =    0.10135   × 9.8 N =  0.99323  N

The string is not horizontal as the rubber bung moves around .In fact , the bung moves in a circle of radius r=Lsinθ.The tension T thus provides both the centipetal force and a force to support the weight of the bung.

...read more.


The force exerted on the rubber bung include the centripetal force and gravitational pull of the object.

The direction of centripetal force is towards the centre of the circle and the gravitational pull is downward force.

The resultant force is along the string which pointing towards the centre of the circle.

3)What is the weight of the screw nuts in this experiment represents?

Since the tension in one single string is always the same at any point of the string, By T = Mg, the weight of the screw nuts is the tension of the string which equals to the centripetal force acting on the rubber bung.

4)How the forces on the revolving bung and the hanging screw nuts are related?                

By solving T=Mg and T=mω2L   Mg= T=mω2L

The weight of the screw nuts is equals to the centipetal force acts on the bung which directly proportion to the angular velocity of the bung.

Possible improvements of the experiment:

  1. The paper mark would sliding during the experiment.Thus highlight pens or marker pens is preferred to use to mark the position instead of paper marker.

...read more.

This student written piece of work is one of many that can be found in our AS and A Level Fields & Forces section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Fields & Forces essays

  1. Peer reviewed

    Investigating the forces acting on a trolley on a ramp

    5 star(s)

    If the experiment was repeated, the trolley could be held initially with an electromagnet which could then be turned off. This would ensure that the initial velocity was 0, or certainly, negligible. A further random error was introduced into the results by the accuracy of the 5mm LEDs on which the light gates work.

  2. Experiment test for F = m2L by whirling a rubber bung (centripetal force)

    The experiment set up was constructed as the diagram below. 3. A certain length (L) of the nylon string from the rubber bung to the glass tube was measured. 4. The nylon string was marked at a position below the glass tube by a small paper marker.

  1. New Technological Advances in Wing Design

    All throughout the wing there will be actuators and sensors which detect everything from the air pressure across the wing to the outside temperature, to

  2. Investigating the relationship of projectile range and projectile motion using a ski jump.

    We can use the equation Ek = 1/2 mv2 to work out the kinetic energy. Ignoring air resistance and friction, we know that the gravitational potential energy at the top of the ramp will equal the kinetic energy when it leaves at the bottom.

  1. Centripetal motion experiment. Objective To study the relationship between the angular speed and ...

    Moreover, ?=, where m=mass of the rubber bung,l=length of the nylon thread, ?=angular speed and t= time taken for complete revolution. Procedure 1. First, weigh and record the mass of the rubber bung(m) in table 1. 2. Construct the experimental setup as shown in Figure a.

  2. Modeling a basketball shoot in the lab

    Precautions/ Safety: Before the experiment, I handed in a plan and was approved at a safety angle by teacher. During the experiment I have also considered many aspects of safety issues. For example, making sure that when I shoot the ball with the spring loaded plunger, I would not hit

  1. Investigation to determine the viscosity of glycerol.

    Therefore weight = (r=radius of sphere; ?=density of sphere; g=gravitational force) Upward Force There are two upward forces acting on the sphere namely the viscous force and the upthrust or the Archimedes Principle sometimes called buoyancy.

  2. Centripetal Force Experiment. Measure the centripetal force and compare it with the theorectical value ...

    The bung is whirled in absolutely horizontal circle. 4. During wirling, ? and L were kept constant. Random and Systematic Errors Random errors include measuring length of string, time for 20 revolutions (due to reaction time, miscount) and mass of bung/weights (due to wind).

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work