Year 3 Science 12.1.21

Tuesday 12th January 2021 LO: Compare how things move on different surfaces LO: Use results to draw simple conclusions, make predictions for new values, suggest improvements and raise further questions.

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Use push and pull when talking about forces •

Decide on your hypothesis •

•

Select an object

Test the force needed to move it on different surfaces • •

Record your results Was your hypothesis correct?

What do you already know about forces and magnets?

Add ideas to this Padlet: https://padlet.com/jbolton6/forcesandmagnets List as much as you can. Read what the rest of the year group has shared on there already.

You could include questions about what you would like to find out as well.

Which car will need the greatest force (push) to start moving?

Why do you think that?

Which car will need the greatest force (push) to start moving?

Why do you think that?

When scientists have an idea or theory about something, they always want to test it out!

What is your theory?

It is probably something like -

I think it takes more force to make a vehicle start moving on rough surfaces than smooth ones.

How can you test out your theory?

You will need to compare the amount of force it takes to move something like a toy car on different surfaces. But how?

You could just compare them by pushing with your hand.

Would that be a fair test?

Try measuring pull by looping 3 thin rubber bands together into a chain and attaching one end to the front of a toy vehicle with some tape.

You can then gently pull out the rubber band chain along a ruler and measure how far the chain stretches before the vehicle begins to move. It is easier to measure if you use a pencil to stretch it out.

You may have simple force meters you can use.

Or, you could try measuring push with a balloon.

It works best if your balloon is quite over stretched and squashy and it doesn’t have much air in it, e.g. one that has been blown up for a few days and gone small and flabby.

Your task is to test out your theory and make it a fair test!

You will need to decide: • • • • •

What theory you are testing Whether to test push or pull Which different surfaces to test How you will make it fair What you think will happen (your prediction)

Writing up the plan for your experiment What is your hypothesis?

I think that a toy car will need less force to move on a smooth surface than a rough one.

Equipment A toy car, elastic bands, a pencil, a ruler and cellotape.

Variables Lino flooring Carpet Grass Stones Method 1. Join three rubber bands together. Put the pencil through one end of the chain and attach the other end to the front of the toy car.

2. Lay a ruler down parallel to the car and the elastic band chain. Make sure the elastic band chain is held in place by the pencil and stretch the car away from it lining the front of the car up with 0 on the ruler.

Monday 11th January 2021 LO: Compare how things move on different surfaces LO: Use results to draw simple conclusions, make predictions for new values, suggest improvements and raise further questions.

•

Use push and pull when talking about forces •

Decide on your hypothesis •

•

Select an object

Test the force needed to move it on different surfaces • •

Record your results Was your hypothesis correct?