Year 7 _ STEAM

Year 7 _ STEAM

Engineering

BIG QUESTION

How do pulleys work?

Attention!

For the next questions, watch the video snippets and read the sentences to decide between True or False.

Multiple Select

What are the materials used to make a home-made pulley?

• cardboard

• wooden skewer

• small rotating engine

• plastic bottle & bottle cap

• string

Multiple Choice

You need to cut the cardboard in two circles, the same size as the bottle cap.

• True

• False

Multiple Choice

You can use the wooden skewer to make a hole at the centre of the bottle cap and the two pieces of cardboard.

• True

• False

Multiple Choice

You need to glue both sides of the bottle cap to the two cardboard circles.

• True

• False

Multiple Choice

The half plastic bottle works as something we need to pull in the experiment.

• True

• False

Multiple Choice

The strings should be tied at the holes at the bottom of the plastic bottle.

• True

• False

Multiple Choice

To test the pulley you need to tie the string to the skewer too.

• True

• False

Let's investigate!

How can we calculate the mechanical power of pulley system?

Pulleys are not powered by electricity and  don't run on their own,  but can carry a lot of weight. Read the text to find more about the calculation involved in the process.

Attention!

For the next questions, read the article and type the answers to complete the sentences.

The first letter is there to help you!

How Much Weight Does a Pulley Take Off? | SciencingSciencing_Icons_ScienceSciencing_Icons_BiologySciencing_Icons_CellsSciencing_Icons_MolecularSciencing_Icons_MicroorganismsSciencing_Icons_GeneticsSciencing_Icons_Human BodySciencing_Icons_EcologySciencing_Icons_ChemistrySciencing_Icons_Atomic & Molecular StructureSciencing_Icons_BondsSciencing_Icons_ReactionsSciencing_Icons_StoichiometrySciencing_Icons_SolutionsSciencing_Icons_Acids & BasesSciencing_Icons_ThermodynamicsSciencing_Icons_Organic ChemistrySciencing_Icons_PhysicsSciencing_Icons_Fundamentals-PhysicsSciencing_Icons_ElectronicsSciencing_Icons_WavesSciencing_Icons_EnergySciencing_Icons_FluidSciencing_Icons_AstronomySciencing_Icons_GeologySciencing_Icons_Fundamentals-GeologySciencing_Icons_Minerals & RocksSciencing_Icons_Earth ScructureSciencing_Icons_FossilsSciencing_Icons_Natural DisastersSciencing_Icons_NatureSciencing_Icons_EcosystemsSciencing_Icons_EnvironmentSciencing_Icons_InsectsSciencing_Icons_Plants & MushroomsSciencing_Icons_AnimalsSciencing_Icons_MathSciencing_Icons_ArithmeticSciencing_Icons_Addition & SubtractionSciencing_Icons_Multiplication & DivisionSciencing_Icons_DecimalsSciencing_Icons_FractionsSciencing_Icons_ConversionsSciencing_Icons_AlgebraSciencing_Icons_Working with UnitsSciencing_Icons_Equations & ExpressionsSciencing_Icons_Ratios & ProportionsSciencing_Icons_InequalitiesSciencing_Icons_Exponents & LogarithmsSciencing_Icons_FactorizationSciencing_Icons_FunctionsSciencing_Icons_Linear EquationsSciencing_Icons_GraphsSciencing_Icons_QuadraticsSciencing_Icons_PolynomialsSciencing_Icons_GeometrySciencing_Icons_Fundamentals-GeometrySciencing_Icons_CartesianSciencing_Icons_CirclesSciencing_Icons_SolidsSciencing_Icons_TrigonometrySciencing_Icons_Probability-StatisticsSciencing_Icons_Mean-Median-ModeSciencing_Icons_Independent-Dependent VariablesSciencing_Icons_DeviationSciencing_Icons_CorrelationSciencing_Icons_SamplingSciencing_Icons_DistributionsSciencing_Icons_ProbabilitySciencing_Icons_CalculusSciencing_Icons_Differentiation-IntegrationSciencing_Icons_ApplicationSciencing_Icons_ProjectsSciencing_Icons_BiologySciencing_Icons_ChemistrySciencing_Icons_PhysicsSciencing_Icons_GeologySciencing_Icons_NatureSciencing_Icons_ArithmeticSciencing_Icons_AlgebraSciencing_Icons_GeometrySciencing_Icons_Probability-StatisticsSciencing_Icons_CalculusSciencing_Icons_News

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Multiple Select

Tick examples of simple machines:

• wheel and axle

• pulley

• combustion engine

• inclined plane

• steam machine

Fill in the Blanks

MA - or mechanical a

- is the ratio of the output force of a machine to the force you apply to it.

Fill in the Blanks

To define a machine, the o

force has to be greater the the input force.

Fill in the Blanks

The greater the MA, the l

force you need to input to the machine to make it work.

Fill in the Blanks

To calculate the MA of a pulley system, first calculate the force that is necessary to l

a load to a certain height without a pulley - the output force.

Fill in the Blanks

Then, calculate the force necessary to lift the same load with the pulley - the i

force.

Fill in the Blanks

For a simple pulley system, count the number of r

that carry the load / weight.

Fill in the Blanks

If energy is always conserved, w

must be conserved.

Fill in the Blanks

In a single pulley system, the force you need to put is the same as the load / w

you are trying to lift.

Fill in the Blanks

So, in a pulley system of two ropes, you only have to put h

force as the weight of the load to lift it.