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# Science revision

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### Science revision

1. 1. Science Year Six Revision
2. 2. ForceA ____ is an action of moving anobject away, a ____ is an actionof bringing an object towards us.push, pullTrue or false~Forces cannot be seen. ( )We can feel the effects of force. ( )A force is a pull or a push. ( )True x 3
3. 3. ForceWhat can a force do?Slow down a moving object. ( )Change the shape of objects. ( )Cause a stationary object to move. ( )Speed up a moving object. ( )Stop a moving object. ( )Change the direction of a movingobject. ( )Change the size of objects. ( )
4. 4. Force____ is a force that opposes motion.FrictionDifferent types of ____ in contacthave different ____ of friction.surface, amountA ____ ____ has less friction while a____ ____ has more friction.smooth surface, rough surface
5. 5. ForceWe can reduce friction by using~ball bearingstalcum powderrough surfacelubricantsdry surfacesrollersair cushion
6. 6. ForceForce can be a nuisance. Itproduce ____ and causes ____and ____.heat, wear, tearForce can be useful. It preventsthings from ____.slippingA smooth surface enables amoving object to travel ____.farther
7. 7. MovementA fast moving object takes a ________ to reach its destination.shorter timeA fast moving objects travel a____ ____ in a given time.longer distanceWe can measure how fast or slowan object moves by using ____.speed
8. 8. MovementSpeed involves ____ and ____.distance, timeThe unit for speed are ____,____ or ____.kilometre per hour, metre persecond, centimetre per secondSpeed can be calculated by usingthe formula ____.Speed = distance / time
9. 9. Food PreservationSpoilt food can be detected by their ____,____, ____ or ____.taste, touch, smell, sight____ can cause food to spoil.MicroorganismsMicroorganisms need ____, ____, ____,____ and ____ to grow.air, water, nutrient, suitable temperature,suitable acidity
10. 10. Food PreservationMicroorganisms will grow within a range of____ and ____ degree celcius.5, 65____ and ____ are processes of preservingfood by heating and then sealing it in anairtight container.Bottling, canning____ removes most water from food.drying
11. 11. Food Preservation____ and ____ slow down the action ofmicroorganisms.Cooling, freezing____ keeps food by sucking air out from itspackaging.Vacuum packing____ is the process of drying food withsmoke for a long period of time.Smoking
12. 12. Food Preservation____ dips food into liquid wax to preventgrowth of fungi and loss of moisture.Waxing____ means heating food to a certaintemperature for some time followed byrapid cooling.Pasteurization____ kills most bacteria.Boiling
13. 13. Food PreservationSugar, vinegar or other acids are used in____ food.pickling____ is an age-old way of preserving food.SaltingWe need to preserve food so that they will____ ____, easy to transported and ____, aswell as to reduce ____ ____.last longer, store, food wastage
14. 14. Waste Management____ are things that we no longer use andwould throw away.WasteFood and plants that are thrown away areknown as ____ ____.organic wasteWaste that come from our home, factoriesand agriculture are called ____ ____.chemical waste
15. 15. Waste ManagementImproper disposal of waste may cause____, ____, ____, ____ or ____.air pollution, water pollution, acid rain,sickness/diseases, flash floodsThe local authorities provide garbagetrucks to collect waste and sent to____.landfillsWe can burn the waste in an ____.
16. 16. Waste ManagementSome waste ____ while some do not ____.decay____ help the waste to decay, we call thisprocess ____.Bacteria, decompositionWaste that decay add ____ to the soil.nutrientDecaying waste lower the ____ content inwater.oxygen
17. 17. Waste ManagementTrue or false~Biodegradable plastic can decay.Domestic wastes is waste that isprocessed from the factory.Decaying waste produce bad smellsand toxic chemicals.Compost is toxic to plants.Washing with polluted water may causeirritation of the skin.