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

Controlled Assesment Experiment - The extension of a rubber band depends on the force applied.

Extracts from this document...

Introduction

________________

SCIENCE

CONTROLLED ASSESMENT

The extension of a rubber band depends on the force applied.

Hypothesis

I anticipate that an increase in the load on the elastic band will result in an increase in the extension of it. I think that the extension will be proportional to the load on the elastic band. I think that there will be a certain amount or energy lost and that this will increase proportionally as the load increase. This will be lost due to heat energy.

What are forces?

Force is defined as a push or pull that changes an object's state of motion or causes the object to deform (change the natural form). Newton defined a force as anything that caused an object to accelerate -F = ma, where F is force, m is mass and a is represented as acceleration. Friction is the resistance between two surfaces that are in contact with each other.

A force acting on an object may cause the object to change direction, to change shape, to start moving, to stop moving, to accelerate or decelerate.

The familiar force of gravity pulls you down into your seat, towa rd the Earth's Center. It feels like your weight. Without these fundamental forces, human and all the other matter in the world would fall apart and float away.

Example:

...read more.

Middle

* The extension of an elastic object is directly proportional to the force applied, provided that

           the limit of proportionality is not exceeded :

F = k x e

F is the force in newton (N).

k is the spring constant in newton per metre (N/m).

e is the extension in metre (m).

Mass and weight are different in physics. For example, mass doesn't change when you go to the Moon, but your weight does. Mass shows the quantity, and weight shows the size of gravity.

If you know your mass, you can easily find your weight because

         W = mg

where:

* W is weight in Newton (N),

* m is mass in kg, and

* g is the acceleration of gravity in m/s2

        Momentum measures the 'motion content' of an object, and is based on the object's mass and velocity. Momentum doubles, for example, when velocity doubles. Similarly, if two objects are moving with the same velocity, one with twice the mass of the other also has twice the momentum.

Force, on the other hand, is the push or pull that is applied to an object to CHANGE its momentum. Newton's second law of motion defines force as the mass times ACCELERATION.

...read more.

Conclusion

1. I will suspend a rubber band from a cup hook screwed into the top of a doorway.

2.  A metal ring that can be opened/closed will now be attached to the suspended band,

3. I will hang a bucket beneath, so that I can add weight.

4. Now I will measure the extension of the rubber band without any weight

5. I will now a 2p coins to the bucket, to see how the weight can affect the extension, I will allow the elastic band to stretch and stay in position for 60 seconds before taking a reading, with my ruler

6. Each time I will add a 2p coin.

7. I will keep adding weights and taking note of the extension until the rubber band exceeds the elastic limit.

8. I'm repeating the test two times, to get an average.

RISK ASSESSMENT

This experiment does not carry many hazards. Bags and coats will be moved out of the way to ensure that no one will trip over them. Whilst loading the elastic band care will be taken to make sure that the elastic band is loading carefully to try and ensure it does not snap. However I will be wearing safety glasses to prevent injuries to my eyes if the band does snap

Variables:

Independent: Mass hung on elastic

Dependant: Length that the elastic extends or retracts.

Controlled: Same conditions – thus the behaviour of the elastic is constant and Temperature of the rubber band

                                                                                                                                                  Romanna Karam

...read more.

This student written piece of work is one of many that can be found in our GCSE Forces and Motion 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 GCSE Forces and Motion essays

  1. Marked by a teacher

    Do Elastic Bands Obey Hooke Law

    3 star(s)

    The length of the stretched object should be proportional to the force applied to it. For the graph we can see that the gradient is not straight. There for we can almost immediately tell from our results that this rubber band might not apply to Hooke's Law Evaluation; To have

  2. Investigate how the weight of an object affects the force required to overcome friction.

    for the wood on the surfaces I have used, which I feel aren't very accurate.

  1. Bouncing Ball Experiment

    The experiment was conducted well however as the utmost efforts were brought into place to avoid parallax error and it was ensured as far as possible that factors that affected how high the ball bounced, excluding the height, were kept constant throughout the experiment.

  2. In this experiment I aim to find out how the force and mass affect ...

    This is because the greater the mass of an object the more force it needs to accelerate it. In my prediction I was very close to the actual results, as I knew that all objects accelerated at the same rate and as I knew that at 90� it accelerated at

  1. My objective in this experiment is to find out how a spring varies in ...

    This ratio is known as its Young's Modulus. Young's Modulus can be calculated from the stress and the strain of an object under tensile/compressive stress. e = change in length/extension of object, in cm p = original length of object, in cm a = cross-sectional area of object, in cm2 f = size of force applied, in newtons

  2. Squash Ball and Temperature Investigation

    at which height the ball would give a large bounce back height and produce the fewest inaccuracies. In order to do this, a range of heights were taken from 40cm to 100cm and bounce tests were carried out 5 times each for each individual height.

  1. Investigating the amazingness of theBouncing Ball!

    When the ball hits the surface this exerts a force on these polymer chains stretching them out. The Intermolecular forces between the polymer chains then act against this force to 're-entwine' the polymer chains. So I believe that the hotter the ball the more energy supplied to the polymer chains,

  2. Isaac Newton's second Law of Motion states that, Force = Mass x Acceleration.

    This is important because if I didn't do this then the friction that would occur would slow down the trolley and I would get anomalous results. I will use differing amounts of weights to pull the trolley down the runway.

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