FACTFILE

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Pupil Resource Sheet

Measuring Forces

FACTFILE
n    The easiest way to measure force is with a Newton metre or spring
balance.

n    Speed is measured by taking the time and dividing it into the distance
travelled.

n    Air pressure is measured using either an aneroid or a mercury
barometer.

n    In a mercury barometer the pressure of the air is registered on the
mercury which moves up a scale.

n    In an aneroid barometer the pressure pushes onto a thin box of air
and this moves a lever.

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Pupil Resource Sheet

Measuring Forces

You are going to try to find the

n    How can you measure forces?

n    How can you measure the force of gravity?

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Pupil Resource Sheet

Measuring Forces

NOW TRY THIS
You will need:
n    A stop clock
n    A toy car
n    A slope that can be made of a
piece of wood
n    A set of bathroom scales
n    A tin can with three holes in
one side one above the other
n    A barometer
n    A spring and 4 weights of
known weight
n    A metre rule

Experiment 1 - Measuring the effects of force by
measuring distance and speed of an object
n    Use the toy car a stopwatch and a slope.
n    Try to think of a way of always using the same force to push the car
along.
n    Use your slope /plank of wood and lay it flat
n    Push the car along on the flat surface and measure the distance it
travelled and the length of time it took
n    The speed is calculated by dividing the distance the car travelled by
the time it took.
n    Write out the sum and your working out
n    What was the speed of the car?
n    Continue this experiment by making a gradual slope and a steep slope
and repeat the measurements and record them
n    Record this on the chart on the next page

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Pupil Resource Sheet

Measuring Forces

Situation            Distance           Time               Speed

Car on flat

Car on slope 1

Car on slope 2

Car on different
surface

n    What was the effect on the car of the different situations?

n    Did friction play a part? How?

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Pupil Resource Sheet

Measuring Forces

Experiment 2 - Force

You will need a set of bathroom scales.

n    Hold the scales close to your chest with the scale showing on the
outside

scale towards your chest with flat hands

n    What is the measure of the force of pressure that you are applying?

n    Try again.

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Pupil Resource Sheet

Measuring Forces

Experiment 3 - Pressure in liquids

n    Fill the tin can to the top with water.

Do this over the sink .

Watch the flow of water and the angle of
the flow and draw the results.

What force was working here?

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Pupil Resource Sheet

Measuring Forces

Experiment 4 - Measuring the effects of the force of weight

You will need a spring and a set of weights and a ruler

n    Draw a bar graph of your results with the weight on the y axis and the
length that the spring stretched on the x axis

n    Measure the length of the spring without the weights and record it on

n    Place a weight on the end of the spring it is best to start with the
lightest weights first

n    Measure the length of he spring and record

n    Repeat the experiment with all the weights and draw your bar chart.

n    What can you now say about the spring and the weights?

n    Write this as a conclusion

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Pupil Resource Sheet

Measuring Forces

NOW TRY THIS
Look at the barometer with the teacher.

n How does it work?

n What does it measure?

n Why is this useful information?

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