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Forces - Changing Shape
Clay can be moulded into different shapes, like these colourful men!

Forces - Changing Shape

Discover how pushes and pulls can squash, stretch, bend and twist objects, and learn which materials spring back and which stay changed.

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Fascinating Fact:

Soft or hard. Soft materials, like clay, are easy to squash. Hard materials, like metal spoons, are harder to change.

In KS1 Science, children learn that forces are pushes and pulls that can change how things move or change their shape. Some materials bend or squash easily, while others stay firm.

  • Force: A push or a pull that can move something or change its shape.
  • Elastic: A material that stretches or squashes but then returns to its original shape.
  • Rigid: A hard material that does not bend or change shape easily.
What does it mean when a force changes the shape of an object?

When a force changes the shape of an object, it squashes, stretches, bends, or twists it. The object may spring back or stay in its new shape.

Which materials change shape easily in KS1 science?

Materials like clay, playdough, rubber bands, and soft foam change shape easily. They show how different materials respond differently to pushes and pulls.

How can I show changing shape with a simple KS1 experiment?

Children can press a sponge, stretch a rubber band, or bend a plastic straw. They observe which items return to normal and which stay changed to understand forces.

1 .
Mike pulls on a rubber band. It stretches and gets longer. What happens when Mike stops pulling?
The rubber band goes back to its original shape
The rubber band stays longer
The rubber band gets even longer
The rubber band changes colour
Rubber bands are elastic. They can go back to their original shape and size
2 .
The man is squashing an empty drinks can. The can changes shape. The can:
Will go back to its original shape
Will stay in its new shape
Will rebound like a rubber ball
Will spring back like a rubber band
This change in shape is permanent
3 .
Susan makes pottery. She mixes clay and water. She ______ the clay on a potter’s wheel.
Draws
Paints
Shapes
Drags
The clay can be shaped. The clay is moulded. The clay stays in its new shape
4 .
Thin metal can change shape if you push hard enough.

This car has had a bump. Another car bumped into it. The car has a dent. It has changed _____.
Colour
Shape
Size
Weight
It is very hard to repair the dent. It is hard to put it back to the original shape
5 .
The picture is of a blacksmith making a horse-shoe. The blacksmith makes the horse-shoe from steel.

It is very difficult to change the shape of the steel. The blacksmith has to heat the steel so it is red hot and then hit it with a hammer. This is because steel is a ____ material.
Weak
Hard
Soft
Bendy
What shape is a horse-shoe?
6 .
Alice is rolling pastry. When Alice has rolled the pastry, the pastry is _______.
Heavier
Thicker
Colder
Thinner
Do you like rolling pastry?
7 .
These puppets are made from modelling clay. This shows that modelling clay can be ______.
Melted
Burned
Shaped
Stirred
What is the best thing you have ever made with modelling clay?
8 .
This man is making bread. He is working the dough. He pushes and pulls the dough. Every time he does this the dough:
Changes shape
Changes colour
Bounces back to its original shape
Gets heavier
Have you ever made bread? Have you ever worked the dough?
9 .
Ben pushes down on the play dough. What happens?
The play dough changes shape
The play dough melts
The play dough bounces back to its original shape
Nothing happens
What can you make with modelling clay?
10 .
Beatrice sits down on a bean bag. The bean bag:
Changes shape
Stays the same shape
Gets much bigger
Gets much smaller
Do you have a bean bag in your house?
You can find more about this topic by visiting BBC Bitesize - Changing shape of materials

Author:  David Bland (Former Physics Teacher, KS1 Science & Geography Quiz Writer)

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