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

Investigation into cars going down slopes

Extracts from this document...


Name: Leanne Kennedy

Investigation into cars going down slopes

1) Variables

  1. The material and surface of the slope
  2. Gradient of the slope (height)
  3. Type of car – weight, height and the size of the car etc.
  4. Whether you give the car a push as you release it
  5. Height of the car up the slope.

2) The variable, that I am going to investigate, is the height of the car up the slope.

3) Prediction

     My prediction of what I will think will happen is that as the car is placed higher up the slope, then this will give the car more potential energy. Then as the car is released it will have morekinetic energy allowing the car to go faster & further along the run-out. Therefore I predict that the height will be proportional to the velocity squared (speed).

4)The scientificreason for my prediction


                                                       B                                                       C

  • The velocity at A will be 0 as the car isn’t moving but the car however has very high potential energy at A.

...read more.


(This can be written as ½ mv  )

So now the whole of the cars energy =kinetic energy + potential energy

  At A on the diagram the potential energy (mgh) is equal to the kinetic energy (½ mv  ) at B.

The equation for this is:

mgh = ½ mvTherefore the two Ms will cancel out and leave the new equation as  h = v   - As you can see here h is proportional to v


It is also correct to say that the maximum velocity of the car will be at B.

The average velocity is calculated as: DISTANCE  


-So from this equation 2x this will simply give the Maximum velocity and again squaring this value will give you the maximum velocity squared

5) Method for doing my investigation


                                                              B                                                   C

Set up experiment is set up exactly as it is in my prediction.

  1. Firstly, place the car with the front wheels on the line you are starting from.
...read more.


height and up the side of the graph is the Velocity squared. From knowing that the height is proportional to the velocity squared the graph should look something like this-

If there are any anomalous results then these should be repeated again.

At the start of our investigation the car we used was giving us unreliable results and so we decided to do the whole investigation from the beginning but with a different car and also with a different person doing the timing .We definitely made the right decision as we then got better results. From these results we found that the line of best fit on the graph showed a positive correlation, which is what we wanted. However the results weren’t quite right so we re-tested them and found we got better, more reliable results that we could then work from. From the new results we plotted them on a graph and found that what we got was perfect and agreed with our prediction at the start.

...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. Factors Affecting the Speed of a Car after Freewheeling down a Slope

    FINAL INVESTIGATION Apparatus: Power pack Ticker tape Two leads Ticker timer Runway Cellotape Ramp (1m) Metre ruler Trolley Bar Retort stand (X 2) Two clamps Diagram: Plan: 1. The apparatus will be set up as shown in the above diagram.

  2. Squash Ball and Temperature Investigation

    o The height at which the ball is dropped. Even though a metre rule was used, holding the ball exactly at a metre was difficult as the metre rule was set up on the bench and we could just barely reach above the metre point.

  1. Practical Investigation Into Viscosity

    The liquid used for this experiment was engine oil. Although it is easier to measure the rate of descent through engine oil because it is slower, the measured interval remained at 20cm. The results are as follows: Very small Distance Timed (cm)

  2. Free essay

    Physics of racing cars

    A car fitted with a wider tyre is creates the same friction as a thinner tyre because the thinner tyre creates more pressure point hence created more contact between the tyre and road surface whereas, the wider tyre covers more surface area therefore creates the same grip between the tyre and surface.

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