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Year 3 Science Summer Term Parent Overview Topic: Forces Knowledge Organiser Unit Summary Children will be able to: Explain what a force is and how they can move objects in various ways. Compare how things move on different surfaces. Know how magnets attract or repel each other and other materials. Describe magnets as having two poles. Be able to describe why some objects float and some sink. Key Ideas Force A force is something that causes an object to be moved, pushed or pulled in some way. Friction Different surfaces create different amounts of friction. The amount of friction created by an object moving over a surface depends on the roughness of the surface and the object, and the force between them. Magnet Magnets are objects that pull or push things with an invisible force called magnetism. Magnetic Objects/materials that are attracted by magnets are said to be magnetic. Non-magnetic Objects/materials that are not attracted by magnets are said to be non-magnetic. Magnetic Pole The ends of a magnet are called its poles. One end is called the north pole, the other end is called the south pole. The magnetic force is strongest at the ends of magnets. Repel When two objects, or two ends of a magnet, are pushed away from each other. Attract When two objects, or two ends of a magnet, are pulled together. Magnetic field An invisible area of magnetism around a magnet. Density Density is a word we use to describe how much space an object or substance takes up. Surface Tension Surface tension is an effect where the surface of a liquid is strong. The surface can hold up a weight, and the surface of a water droplet holds the droplet together, in a ball shape. Some small things can float on a surface because of surface tension, even though they normally could not float.

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Page 1: z ï ^ ] v ^ µ u u d u W v K À À ] Á o o Z ( } o o } Á ] v P ] …...z ï ^ ] v ^ µ u u d u W v K À À ] Á d } ] W & } < v } Á o P K P v ] h v ] ^ µ u u Ç Z ] o v Á ] o

Year 3 Science Summer Term Parent Overview

Topic: Forces

Knowledge Organiser

Unit Summary

Children will be able to: Explain what a force is and how they can move objects in various ways. Compare how things move on different surfaces. Know how magnets attract or repel each other and other materials. Describe magnets as having two poles. Be able to describe why some objects float and some sink.

Key Ideas

Force A force is something that causes an object to be moved, pushed or pulled in some way.

Friction

Different surfaces create different amounts of friction. The amount of friction created by an object moving over a surface depends on the roughness of the surface and the object, and the force between them.

Magnet Magnets are objects that pull or push things with an invisible force called magnetism.

Magnetic Objects/materials that are attracted by magnets are said to be magnetic.

Non-magnetic Objects/materials that are not attracted by magnets are said to be non-magnetic.

Magnetic Pole The ends of a magnet are called its poles. One end is called the north pole, the other end is called the south pole. The magnetic force is strongest at the ends of magnets.

Repel When two objects, or two ends of a magnet, are pushed away from each other.

Attract When two objects, or two ends of a magnet, are pulled together.

Magnetic field An invisible area of magnetism around a magnet.

Density Density is a word we use to describe how much space an object or substance takes up.

Surface Tension

Surface tension is an effect where the surface of a liquid is strong. The surface can hold up a weight, and the surface of a water droplet holds the droplet together, in a ball shape. Some small things can float on a surface because of surface tension, even though they normally could not float.

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Year 3 Science Summer Term Parent Overview

Watch the PowerPoint and listen to Miss Kenefick’s narration to find out all you need to know about forces. Retrieval Quiz

1. What is a force? 2. How do forces affect an object? 3. Give an example of a something you move with a pull force. 4. Explain the force of friction. 5. Can you see a magnetism move objects? 6. I think that the same poles of a magnet repel each other. Am I

correct? 7. Explain why a cork would float on water. 8. How does washing up liquid effect the surface tension of water?

Activities

1. Pushing and Pulling Activity Sheet. Complete your Pushing and Pulling Activity Sheet to identify the pushing and pulling forces acting on the different objects.

2. Investigating Friction Activity Sheet. Follow the instructions on the activity sheet to set your own investigation into friction If you do not have a toy car, any object with wheels will be fine. How does the surface effect the movement of the car? Can you explain your results using the words force and friction?

3. Investigation Sinking activity Sheet.

Set up your own investigation into whether objects around your home float or sink. Record your findings on the activity sheet.

4. Produce a dual coding poster on everything you have learnt about

forces.

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Year 3 Science Summer Term Parent Overview All the following information is also on the PowerPoint presentation.

What is a force? A force is something that causes an object to be moved, pushed or pulled in some way. There are many different types of force including pushing, pulling, friction, magnetism, floating, sinking and gravity. Push and Pull We use push and pull forces everyday- from opening doors to putting our shoes on! A runner pushes off the ground to move forward, a person playing the piano pushes the keys. Friction The surface which on object travels on can affect how fast it moves. For example, a car can drive quicker on the road than on sand or gravel. It is caused by the force acting on the tyres of the car. We call this force FRICTION. Friction is a rubbing force. Magnetism Magnetism is an unusual force as it can act on an object without having to touch it. Watch these clips to help you learn about magnetism

• https://www.bbc.co.uk/bitesize/topics/zyttyrd A magnetic field is the area around a magnet that produces a pulling force on certain materials. The magnetic field is invisible, so we cannot see it. If you have a magnet and iron filings at home have a go at the activity on the slides. Magnets have two distinct ends- a North and South pole. Opposite poles attract and the same poles repel each other (push each other away). Floating and Sinking An object will sink if it is denser than water. This means if the particles in it are closer together than the particles of water. Things like metal or a brick will sink but a sponge would float. The shape of an object matters too. When more of the surface of an object is touching the water, the object floats better. If you have some plasticine have ago at the activity on the slide. When more of the shape is touching the water, it is more likely to float. The object pushes against the water, but the water pushes back! If lots of the object is touching

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the water, the water will push back enough to make the object float! This means the object is buoyant (even if the material is dense). The surface tension of the water is holding its molecules together strongly. The pin floats on top of the surface! Soap, detergent and washing up liquid break up the bonds between the molecules and makes the surface tension weaker. Pond skaters and other pond creatures use surface tension to stay on top of the water. Boats can float on the water because they are less dense than water. The hull of a boat is hollow and the shape helps it to stay buoyant as well.


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